Company lists · Data refreshed September 2026
Top 25 Cold email infrastructure providers based in the United States
RevenueBase identified 168 company matches for cold email infrastructure providers associated with the United States as of September 2026 and tracks 1,557 professional contacts across them, including 414 with verified work emails and 356 with mobile numbers. New York is the largest hub.
This list covers company matches for cold email infrastructure providers associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 3, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest cold email infrastructure providers based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 189 contacts → | ||||
Exact match “Sinch Mailgun is the leading email delivery service for businesses around the world.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 2 | 106 contacts → | ||||
Exact match “ZeroBounce is an email validation, deliverability and email finding platform helping businesses reduce bounces and land their emails in the inbox.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 3 | 103 contacts → | ||||
Exact match “Email Warm-Up & Deliverability Platform | Land in the Inbox, Not Spam Warmy is an AI-powered email deliverability platform trusted by businesses, marketers, and sales teams…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 4 | 38 contacts → | ||||
Exact match “iPost is a leading email-sending platform purpose-built to solve real challenges in highly regulated and other data- and content-sensitive industries, including gaming, legal…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 5 | 38 contacts → | ||||
Exact match “SendGrid is a proven cloud-based customer communication platform that successfully delivers over 45 billion emails each month for Internet and mobile-based customers like Airbnb…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 6 | 37 contacts → | ||||
Exact match “Maildoso provides high-quality SMTP and Google mailboxes built for cold email deliverability.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 7 | 32 contacts → | ||||
Exact match “Hunter is an all-in-one email outreach platform to identify relevant prospects, find their email addresses, and send cold email campaigns.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 8 | 28 contacts → | ||||
Exact match “Email Industries is a US-based email deliverability services provider that offers innovative products and services aimed at helping businesses like yours optimize their email…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 9 | 25 contacts → | ||||
Exact match “GlockApps Software is a privately held company that offers multiple email marketing solutions to help businesses reach the inbox and solve email deliverability issues.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 10 | 22 contacts → | ||||
Exact match “Inbox Monster helps email teams send epic messages to every inbox.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 11 | 20 contacts → | ||||
Exact match “Kickbox provides technology that promotes email best practices and improves inbox placement, including a full suite of deliverability monitoring and management tools.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 12 | 19 contacts → | ||||
Exact match “Email marketing is a powerful channel for small businesses to generate leads.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 13 | 18 contacts → | ||||
Exact match “Modern email delivery for developer and product teams in growing digital companies.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 14 | 17 contacts → | ||||
Exact match “SocketLabs is an email service provider with a full suite of email delivery, management, and performance analysis tools.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 15 | 14 contacts → | ||||
Exact match “At SendX, we’re passionate about making email marketing simple, affordable, and highly effective.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 16 | 13 contacts → | ||||
Exact match “Reliable and Secure email hosting services for SMB and Enterprise.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 17 | 13 contacts → | ||||
Exact match “Smarter, high-volume email delivery software for tech leaders & marketers.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 18 | 13 contacts → | ||||
Exact match “An AI-powered cold email outreach platform built for scale and deliverability.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 19 | 12 contacts → | ||||
Exact match “ReadyDedis is a company with over a decade of experience in providing and building high-performance infrastructure to provide the best possible experience for your online business.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 20 | 9 contacts → | ||||
Exact match “Senders is focused on email infrastructure, email scaling, email deliverability, and email sendability.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 21 | 8 contacts → | ||||
Exact match “The email delivery service that people actually like.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 22 | 7 contacts → | ||||
Exact match “Warmupinbox.com automatically raises your email sending reputation through our network of inboxes that talk to each other.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 23 | 7 contacts → | ||||
Exact match “Mailforge sets up your email infrastructure (domains + mailboxes) within 5 minutes” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 24 | 5 contacts → | ||||
Exact match “Since 2001, EmailOpen™ has been a leader in innovative electronic mail solutions, delivering proven and measurable results to the internal communication and direct marketing…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
| 25 | 5 contacts → | ||||
Exact match “Following are some of the features MassMailer provides for Salesforce CRM customers.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “cold email infrastructure providers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 168 cold email infrastructure providers based in the United States
See the full list, filter by size, metro and specialty, and access 414 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Cold email infrastructure providers based in the United States at a glance
As of Sep 3, 2026Companies by employee count
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Company records associated with the United States whose business descriptions match “cold email infrastructure providers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 414 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 3, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “cold email infrastructure providers”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many cold email infrastructure providers are there based in the United States?
RevenueBase identified 168 company matches for cold email infrastructure providers associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Sinch Mailgun tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most cold email infrastructure providers?
New York leads with 16 company records, followed by Sheridan (11) and San Francisco (10).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 414 professional contacts with verified work emails tracked across these 168 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 3, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Cold email infrastructure providers based in the United Kingdom
- Cold email infrastructure providers based in London, United Kingdom
- Cold email infrastructure providers based in India
- AI companies based in the United States
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Company intelligence · public preview
Top 25 cold email infrastructure providers based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 168 matching company records for cold email infrastructure providers based in the United States, with 1,557 tracked contacts and 414 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 3, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 cold email infrastructure providers based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Sinch Mailgunmailgun.comHQ: HQ not recorded; location: San Francisco, CA, United StatesReported employees: 201-500 | HQ not recorded; location: San Francisco, CA, United States | 201-500 | Exact match | 189 contacts → |
“Sinch Mailgun is the leading email delivery service for businesses around the world.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Zerobouncezerobounce.netHQ: HQ not recorded; location: Santa Barbara, CA, United StatesReported employees: 51-200 | HQ not recorded; location: Santa Barbara, CA, United States | 51-200 | Exact match | 106 contacts → |
“ZeroBounce is an email validation, deliverability and email finding platform helping businesses reduce bounces and land their emails in the inbox.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  WARMYgetwarmy.comHQ: HQ not recorded; location: San Francisco, CA, United StatesReported employees: 51-200 | HQ not recorded; location: San Francisco, CA, United States | 51-200 | Exact match | 103 contacts → |
“Email Warm-Up & Deliverability Platform | Land in the Inbox, Not Spam Warmy is an AI-powered email deliverability platform trusted by businesses, marketers, and sales teams…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  IPOSTipost.comHQ: HQ not recorded; location: San Mateo, CA, United StatesReported employees: 51-200 | HQ not recorded; location: San Mateo, CA, United States | 51-200 | Exact match | 38 contacts → |
“iPost is a leading email-sending platform purpose-built to solve real challenges in highly regulated and other data- and content-sensitive industries, including gaming, legal…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Sendgridsendgrid.com HQ: HQ not recorded; location: Denver, CO, United StatesReported employees: 201-500 | HQ not recorded; location: Denver, CO, United States | 201-500 | Exact match | 38 contacts → |
“SendGrid is a proven cloud-based customer communication platform that successfully delivers over 45 billion emails each month for Internet and mobile-based customers like Airbnb…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Maildosomaildoso.aiHQ: HQ not recorded; location: Bay, CA, United StatesReported employees: 11-50 | HQ not recorded; location: Bay, CA, United States | 11-50 | Exact match | 37 contacts → |
“Maildoso provides high-quality SMTP and Google mailboxes built for cold email deliverability.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  hunter.iohunter.ioHQ: HQ not recorded; location: Wilmington, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington, DE, United States | 11-50 | Exact match | 32 contacts → |
“Hunter is an all-in-one email outreach platform to identify relevant prospects, find their email addresses, and send cold email campaigns.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Email Industriesemailindustries.comHQ: HQ not recorded; location: Augusta, GA, United StatesReported employees: 11-50 | HQ not recorded; location: Augusta, GA, United States | 11-50 | Exact match | 28 contacts → |
“Email Industries is a US-based email deliverability services provider that offers innovative products and services aimed at helping businesses like yours optimize their email…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Glockappsglockapps.comHQ: HQ not recorded; location: Pinedale, WY, United StatesReported employees: 11-50 | HQ not recorded; location: Pinedale, WY, United States | 11-50 | Exact match | 25 contacts → |
“GlockApps Software is a privately held company that offers multiple email marketing solutions to help businesses reach the inbox and solve email deliverability issues.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Inbox Monsterinboxmonster.comHQ: HQ not recorded; location: Charlotte, NC, United StatesReported employees: 11-50 | HQ not recorded; location: Charlotte, NC, United States | 11-50 | Exact match | 22 contacts → |
“Inbox Monster helps email teams send epic messages to every inbox.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Kickboxkickbox.comHQ: HQ not recorded; location: Dallas, TX, United StatesReported employees: 11-50 | HQ not recorded; location: Dallas, TX, United States | 11-50 | Exact match | 20 contacts → |
“Kickbox provides technology that promotes email best practices and improves inbox placement, including a full suite of deliverability monitoring and management tools.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Xgrowth LLCxgrowthtech.comHQ: HQ not recorded; location: Wilmington, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington, DE, United States | 11-50 | Exact match | 19 contacts → |
“Email marketing is a powerful channel for small businesses to generate leads.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Mailtrapmailtrap.ioHQ: HQ not recorded; location: Los Angeles, CA, United StatesReported employees: 51-200 | HQ not recorded; location: Los Angeles, CA, United States | 51-200 | Exact match | 18 contacts → |
“Modern email delivery for developer and product teams in growing digital companies.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Socketlabssocketlabs.comHQ: HQ not recorded; location: Wayne, PA, United StatesReported employees: 11-50 | HQ not recorded; location: Wayne, PA, United States | 11-50 | Exact match | 17 contacts → |
“SocketLabs is an email service provider with a full suite of email delivery, management, and performance analysis tools.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  SENDXsendx.ioHQ: HQ not recorded; location: Wilmington County Of New Castle, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington County Of New Castle, DE, United States | 11-50 | Exact match | 14 contacts → |
“At SendX, we’re passionate about making email marketing simple, affordable, and highly effective.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Duocircleduocircle.comHQ: HQ not recorded; location: San Diego, CA, United StatesReported employees: 11-50 | HQ not recorded; location: San Diego, CA, United States | 11-50 | Exact match | 13 contacts → |
“Reliable and Secure email hosting services for SMB and Enterprise.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Greenarrow Emailgreenarrowemail.comHQ: HQ not recorded; location: Schneider, IN, United StatesReported employees: 11-50 | HQ not recorded; location: Schneider, IN, United States | 11-50 | Exact match | 13 contacts → |
“Smarter, high-volume email delivery software for tech leaders & marketers.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Reachinboxreachinbox.aiHQ: HQ not recorded; location: Wilmington, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington, DE, United States | 11-50 | Exact match | 13 contacts → |
“An AI-powered cold email outreach platform built for scale and deliverability.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Readydedis, LLCreadydedis.comHQ: HQ not recorded; location: Newark, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Newark, DE, United States | 11-50 | Exact match | 12 contacts → |
“ReadyDedis is a company with over a decade of experience in providing and building high-performance infrastructure to provide the best possible experience for your online business.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Senderssenders.coHQ: HQ not recorded; location: Brooklyn, NY, United StatesReported employees: 11-50 | HQ not recorded; location: Brooklyn, NY, United States | 11-50 | Exact match | 9 contacts → |
“Senders is focused on email infrastructure, email scaling, email deliverability, and email sendability.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Postmarkpostmarkapp.comHQ: HQ not recorded; location: Chicago, IL, United StatesReported employees: 11-50 | HQ not recorded; location: Chicago, IL, United States | 11-50 | Exact match | 8 contacts → |
“The email delivery service that people actually like.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Warmup Inboxwarmupinbox.comHQ: HQ not recorded; location: Philadelphia, PA, United StatesReported employees: 11-50 | HQ not recorded; location: Philadelphia, PA, United States | 11-50 | Exact match | 7 contacts → |
“Warmupinbox.com automatically raises your email sending reputation through our network of inboxes that talk to each other.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Mailforgemailforge.aiHQ: HQ not recorded; location: CA, United StatesReported employees: 51-200 | HQ not recorded; location: CA, United States | 51-200 | Exact match | 7 contacts → |
“Mailforge sets up your email infrastructure (domains + mailboxes) within 5 minutes” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Emailopenemailopen.comHQ: HQ not recorded; location: Malibu, CA, United StatesReported employees: 11-50 | HQ not recorded; location: Malibu, CA, United States | 11-50 | Exact match | 5 contacts → |
“Since 2001, EmailOpen™ has been a leader in innovative electronic mail solutions, delivering proven and measurable results to the internal communication and direct marketing…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Massmailer, INCmassmailer.ioHQ: HQ not recorded; location: Dover, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Dover, DE, United States | 11-50 | Exact match | 5 contacts → |
“Following are some of the features MassMailer provides for Salesforce CRM customers.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 168 company matches
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Cold email infrastructure providers: dataset insights
September 3, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
167 records in the displayed employee bands.
1 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 3, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for cold email infrastructure providers?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many cold email infrastructure providers did RevenueBase find based in the United States?
The saved snapshot records 168 matching company records, 1,557 tracked contacts and 414 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 3, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Cold email infrastructure providers by geography
Cite this list
RevenueBase Data Team. Top 25 cold email infrastructure providers based in the United States. Snapshot: September 3, 2026. https://revenuebase.ai/companies/cold-email-infrastructure-providers/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Cold email infrastructure providers based in the United Kingdom
- Cold email infrastructure providers based in London, United Kingdom
- Cold email infrastructure providers based in India
- AI companies based in the United States
- Cybersecurity companies based in the United States
- Manufacturing companies based in the United States
Company intelligence · public preview
Top 25 cold email infrastructure providers based in the United States
RevenueBase records 168 matching company records for cold email infrastructure providers based in the United States, with 1,557 tracked contacts and 414 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 3, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 cold email infrastructure providers based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Sinch Mailgunmailgun.com HQ: HQ not recorded; location: San Francisco, CA, United StatesReported employees: 201-500 | HQ not recorded; location: San Francisco, CA, United States | 201-500 | Exact match | 189 contacts → |
“Sinch Mailgun is the leading email delivery service for businesses around the world.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Zerobouncezerobounce.net HQ: HQ not recorded; location: Santa Barbara, CA, United StatesReported employees: 51-200 | HQ not recorded; location: Santa Barbara, CA, United States | 51-200 | Exact match | 106 contacts → |
“ZeroBounce is an email validation, deliverability and email finding platform helping businesses reduce bounces and land their emails in the inbox.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | WARMYgetwarmy.com HQ: HQ not recorded; location: San Francisco, CA, United StatesReported employees: 51-200 | HQ not recorded; location: San Francisco, CA, United States | 51-200 | Exact match | 103 contacts → |
“Email Warm-Up & Deliverability Platform | Land in the Inbox, Not Spam Warmy is an AI-powered email deliverability platform trusted by businesses, marketers, and sales teams…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | IPOSTipost.com HQ: HQ not recorded; location: San Mateo, CA, United StatesReported employees: 51-200 | HQ not recorded; location: San Mateo, CA, United States | 51-200 | Exact match | 38 contacts → |
“iPost is a leading email-sending platform purpose-built to solve real challenges in highly regulated and other data- and content-sensitive industries, including gaming, legal…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Sendgridsendgrid.com HQ: HQ not recorded; location: Denver, CO, United StatesReported employees: 201-500 | HQ not recorded; location: Denver, CO, United States | 201-500 | Exact match | 38 contacts → |
“SendGrid is a proven cloud-based customer communication platform that successfully delivers over 45 billion emails each month for Internet and mobile-based customers like Airbnb…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Maildosomaildoso.ai HQ: HQ not recorded; location: Bay, CA, United StatesReported employees: 11-50 | HQ not recorded; location: Bay, CA, United States | 11-50 | Exact match | 37 contacts → |
“Maildoso provides high-quality SMTP and Google mailboxes built for cold email deliverability.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | hunter.iohunter.io HQ: HQ not recorded; location: Wilmington, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington, DE, United States | 11-50 | Exact match | 32 contacts → |
“Hunter is an all-in-one email outreach platform to identify relevant prospects, find their email addresses, and send cold email campaigns.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Email Industriesemailindustries.com HQ: HQ not recorded; location: Augusta, GA, United StatesReported employees: 11-50 | HQ not recorded; location: Augusta, GA, United States | 11-50 | Exact match | 28 contacts → |
“Email Industries is a US-based email deliverability services provider that offers innovative products and services aimed at helping businesses like yours optimize their email…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Glockappsglockapps.com HQ: HQ not recorded; location: Pinedale, WY, United StatesReported employees: 11-50 | HQ not recorded; location: Pinedale, WY, United States | 11-50 | Exact match | 25 contacts → |
“GlockApps Software is a privately held company that offers multiple email marketing solutions to help businesses reach the inbox and solve email deliverability issues.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Inbox Monsterinboxmonster.com HQ: HQ not recorded; location: Charlotte, NC, United StatesReported employees: 11-50 | HQ not recorded; location: Charlotte, NC, United States | 11-50 | Exact match | 22 contacts → |
“Inbox Monster helps email teams send epic messages to every inbox.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Kickboxkickbox.com HQ: HQ not recorded; location: Dallas, TX, United StatesReported employees: 11-50 | HQ not recorded; location: Dallas, TX, United States | 11-50 | Exact match | 20 contacts → |
“Kickbox provides technology that promotes email best practices and improves inbox placement, including a full suite of deliverability monitoring and management tools.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Xgrowth LLCxgrowthtech.com HQ: HQ not recorded; location: Wilmington, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington, DE, United States | 11-50 | Exact match | 19 contacts → |
“Email marketing is a powerful channel for small businesses to generate leads.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Mailtrapmailtrap.io HQ: HQ not recorded; location: Los Angeles, CA, United StatesReported employees: 51-200 | HQ not recorded; location: Los Angeles, CA, United States | 51-200 | Exact match | 18 contacts → |
“Modern email delivery for developer and product teams in growing digital companies.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Socketlabssocketlabs.com HQ: HQ not recorded; location: Wayne, PA, United StatesReported employees: 11-50 | HQ not recorded; location: Wayne, PA, United States | 11-50 | Exact match | 17 contacts → |
“SocketLabs is an email service provider with a full suite of email delivery, management, and performance analysis tools.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | SENDXsendx.io HQ: HQ not recorded; location: Wilmington County Of New Castle, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington County Of New Castle, DE, United States | 11-50 | Exact match | 14 contacts → |
“At SendX, we’re passionate about making email marketing simple, affordable, and highly effective.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Duocircleduocircle.com HQ: HQ not recorded; location: San Diego, CA, United StatesReported employees: 11-50 | HQ not recorded; location: San Diego, CA, United States | 11-50 | Exact match | 13 contacts → |
“Reliable and Secure email hosting services for SMB and Enterprise.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Greenarrow Emailgreenarrowemail.com HQ: HQ not recorded; location: Schneider, IN, United StatesReported employees: 11-50 | HQ not recorded; location: Schneider, IN, United States | 11-50 | Exact match | 13 contacts → |
“Smarter, high-volume email delivery software for tech leaders & marketers.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Reachinboxreachinbox.ai HQ: HQ not recorded; location: Wilmington, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Wilmington, DE, United States | 11-50 | Exact match | 13 contacts → |
“An AI-powered cold email outreach platform built for scale and deliverability.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Readydedis, LLCreadydedis.com HQ: HQ not recorded; location: Newark, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Newark, DE, United States | 11-50 | Exact match | 12 contacts → |
“ReadyDedis is a company with over a decade of experience in providing and building high-performance infrastructure to provide the best possible experience for your online business.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Senderssenders.co HQ: HQ not recorded; location: Brooklyn, NY, United StatesReported employees: 11-50 | HQ not recorded; location: Brooklyn, NY, United States | 11-50 | Exact match | 9 contacts → |
“Senders is focused on email infrastructure, email scaling, email deliverability, and email sendability.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Postmarkpostmarkapp.com HQ: HQ not recorded; location: Chicago, IL, United StatesReported employees: 11-50 | HQ not recorded; location: Chicago, IL, United States | 11-50 | Exact match | 8 contacts → |
“The email delivery service that people actually like.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Warmup Inboxwarmupinbox.com HQ: HQ not recorded; location: Philadelphia, PA, United StatesReported employees: 11-50 | HQ not recorded; location: Philadelphia, PA, United States | 11-50 | Exact match | 7 contacts → |
“Warmupinbox.com automatically raises your email sending reputation through our network of inboxes that talk to each other.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Mailforgemailforge.ai HQ: HQ not recorded; location: CA, United StatesReported employees: 51-200 | HQ not recorded; location: CA, United States | 51-200 | Exact match | 7 contacts → |
“Mailforge sets up your email infrastructure (domains + mailboxes) within 5 minutes” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Emailopenemailopen.com HQ: HQ not recorded; location: Malibu, CA, United StatesReported employees: 11-50 | HQ not recorded; location: Malibu, CA, United States | 11-50 | Exact match | 5 contacts → |
“Since 2001, EmailOpen™ has been a leader in innovative electronic mail solutions, delivering proven and measurable results to the internal communication and direct marketing…” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Massmailer, INCmassmailer.io HQ: HQ not recorded; location: Dover, DE, United StatesReported employees: 11-50 | HQ not recorded; location: Dover, DE, United States | 11-50 | Exact match | 5 contacts → |
“Following are some of the features MassMailer provides for Salesforce CRM customers.” Recorded description excerpt · September 3, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 168 company matches
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Cold email infrastructure providers: dataset insights
September 3, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
167 records in the displayed employee bands.
1 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 3, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for cold email infrastructure providers?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many cold email infrastructure providers did RevenueBase find based in the United States?
The saved snapshot records 168 matching company records, 1,557 tracked contacts and 414 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 3, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Cold email infrastructure providers by geography
Cite this list
RevenueBase Data Team. Top 25 cold email infrastructure providers based in the United States. Snapshot: September 3, 2026. https://revenuebase.ai/companies/cold-email-infrastructure-providers/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
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