Company lists · Data verified August 2026

Top 21 Email compliance software based in the United States

Name: Email compliance software based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 43 companies tracked

There are 43 email compliance software headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 2,325 professional contacts across them, including 234 with verified work emails and 369 with mobile numbers. New York is the largest hub.

This list covers email compliance software headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

43Companies

2,325Contacts tracked

234Verified emails

369Mobile numbers

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The 21 largest email compliance software based in the United States

Ranked by team size

Top 21 of 43 email compliance software based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Global Relay	New York, NY	1,001-5,000	1,643	1
2	ZIX	Dallas, TX	501-1,000	200	64
3	Mirrorweb	Austin, TX	51-200	78	57
4	Custodia	New York, NY	51-200	44	28
5	Optizmo Technologies, LLC	Boulder, CO	11-50	26	14
6	Collabware	Washington, DC	11-50	24	18
7	Intradyn	Bloomington, MN	11-50	22	13
8	17a-4 LLC	New York, NY	11-50	21	12
9	Lowkey	San Francisco, CA	11-50	13	1
10	Identillect Technologies INC	Poway, CA	11-50	10	3
11	Efusion	Raleigh, NC	1-10	10	1
12	Fairwords By Mycomplianceoffice	Longmont, CO	11-50	7	2
13	Emailopen	Malibu, CA	11-50	5	4
14	Sitequest IS NOW RED OAK Compliance	Woods Cross, UT	11-50	5	4
15	Otter Technologies, INC	Boulder, CO	1-10	5	2
16	Comensure	Houston	11-50	4	3
17	Messagewatcher, LLC	Denver, CO	11-50	4	1
18	Conexxus	Louisville, KY	11-50	4	1
19	Presults	New York, NY	11-50	1	1
20	Reqo, INC	New York	11-50	1	1
21	EZEPO	Berkeley, CA	1-10	1	1

Showing 21 of 43 email compliance software based in the United States

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Email compliance software based in the United States at a glance

As of Aug 28, 2026

11-50Median size (employees)

New YorkLargest hub · 5 HQs

369Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email compliance software by metro

Metro	Companies
Email compliance software in New York	5
Email compliance software in Boulder	3
Email compliance software in Cary	2
Email compliance software in Raleigh	2
Email compliance software in Gainesville	2
Email compliance software in San Francisco	2
Email compliance software in Encino	1
Email compliance software in Waltham	1

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “email compliance software”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many email compliance software are there based in the United States?

There are 43 email compliance software headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Global Relay, headquartered in New York, tops this list with the largest team on record.

Which city has the most email compliance software?

New York leads with 5 headquartered companies, followed by Boulder (3) and Cary (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 234 verified decision-maker contacts tracked across these 43 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.