Company lists · Data refreshed September 2026

Top 25 Email support outsourcing services worldwide

Name: Email support outsourcing services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 2,721 companies tracked

RevenueBase identified 2,721 email support outsourcing services worldwide as of September 2026 and tracks 63,289 professional contacts across them, including 5,158 with verified work emails. The United States is the largest market and Lahore the largest hub.

This list covers email support outsourcing services worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026. Country and city lists for email support outsourcing services follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

2,721Companies

63,289Contacts tracked

5,158Verified emails

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The 25 largest email support outsourcing services worldwide

Ranked by team size

Top 25 of 2,721 email support outsourcing services worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to email support outsourcing services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Emtelco S.A	Indirect evidence	Medellín, ColombiaHQ checked Sep 28, 2026	10001+	4,998 contacts →
	Indirect evidence “Maximizamos el valor de cada contacto de las empresas con sus clientes, gestionando los procesos de relacionamiento a través de canales tefónicos, virtuales y presenciales.” Source: RevenueBase Database · checked Sep 28, 2026
2	GSS Global Sales Solutions	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	10001+	3,716 contacts →
	Indirect evidence “is a tech company specialized in providing, and for.” Source: RevenueBase Database · checked Sep 28, 2026
3	Allied Global	Indirect evidence	GuatemalaHQ checked Sep 28, 2026	5,001-10,000	1,979 contacts →
	Indirect evidence “Regardless of your Company’s size (from Start-ups to Fortune 500), business vertical or service requirements, we act as a seamless extension of your team to help you grow, and…” Source: RevenueBase Database · checked Sep 28, 2026
4	Technotask Business Solutions PVT LTD	Indirect evidence	Bhopal, IndiaHQ checked Sep 28, 2026	1,001-5,000	1,762 contacts →
	Indirect evidence “Transforming Customer Experiences Worldwide** At Technotask, we've embarked on a journey of exponential growth and innovation since our inception in March 2020.” Source: RevenueBase Database · checked Sep 28, 2026
5	Supportninja	Partial evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,711 contacts →
	Partial evidence “SupportNinja provides customer experience and back-office support services for tech companies and startups around the world.” Source: RevenueBase Database · checked Sep 28, 2026
6	Support Services Group	Partial evidence	Waco, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,710 contacts →
	Partial evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 28, 2026
7	Sybrid Private Limited	Indirect evidence	Karachi, PakistanHQ checked Sep 28, 2026	1,001-5,000	1,609 contacts →
	Indirect evidence “Sybrid (Pvt) Ltd is Pakistan's leading technology solutions provider, helping businesses optimize their operations and drive growth.” Source: RevenueBase Database · checked Sep 28, 2026
8	Horatio	Partial evidence	New York, United StatesHQ checked Sep 28, 2026	1,001-5,000	860 contacts →
	Partial evidence “Horatio is a premier, tech-enabled outsourcing partner helping ambitious companies scale customer experience and complex business operations without compromising quality…” Source: RevenueBase Database · checked Sep 28, 2026
9	Sequential Technology International	Indirect evidence	Bethlehem, United StatesHQ checked Sep 28, 2026	1,001-5,000	758 contacts →
	Indirect evidence “Sequential Tech is the trusted outsource partner of wireline/wireless telecommunication, broadband, cable/MSO, and satellite service providers.” Source: RevenueBase Database · checked Sep 28, 2026
10	Advantage Communications INC	Indirect evidence	Charlottetown, CanadaHQ checked Sep 28, 2026	501-1,000	633 contacts →
	Indirect evidence “With nearly 30 years in service, we've mastered the dynamic between cost-efficiency and customer service, meaning you won't have to sacrifice one for the other.” Source: RevenueBase Database · checked Sep 28, 2026
11	Buwelo Corporate	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 28, 2026	1,001-5,000	598 contacts →
	Partial evidence “Buwelo BPO is a global Business Process Outsourcing provider of multi-channel customer experience and back office solutions.” Source: RevenueBase Database · checked Sep 28, 2026
12	Telenetwork	Partial evidence	San Marcos, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	562 contacts →
	Partial evidence “teleNetwork is a leading provider of outsourced customer service, technical support, and sales enablement solutions for technology products and services.” Source: RevenueBase Database · checked Sep 28, 2026
13	ESP Global Services	Partial evidence	Reading, United KingdomHQ checked Sep 28, 2026	501-1,000	510 contacts →
	Partial evidence “ESP provides IT support services across the globe.” Source: RevenueBase Database · checked Sep 28, 2026
14	Mplus Türkiye	Partial evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	5,001-10,000	489 contacts →
	Partial evidence “Mplus Turkiye, one of Turkey's largest independent outsourcing providers, was founded in in Istanbul.” Source: RevenueBase Database · checked Sep 28, 2026
15	Supportzebra	Strong evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	454 contacts →
	Strong evidence “SupportZebra is a business process outsourcing company based in the Philippines, with headquarters in the Houston,TX region, that specializes in: Sales & Marketing Retention \|…” Source: RevenueBase Database · checked Sep 28, 2026
16	Eastvantage	Partial evidence	Sofia, BulgariaHQ checked Sep 28, 2026	1,001-5,000	452 contacts →
	Partial evidence “Eastvantage is a global managed services and outsourcing partner helping businesses grow with confidence through reliable, scalable, and technology-enabled delivery.” Source: RevenueBase Database · checked Sep 28, 2026
17	Velan Info Services	Indirect evidence	Dover, DE, United StatesHQ checked Sep 28, 2026	201-500	447 contacts →
	Indirect evidence “Velan Info Services is a leading multidisciplinary service provider with its clients across the globe.” Source: RevenueBase Database · checked Sep 28, 2026
18	The Functionary	Indirect evidence	Aubrey, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	415 contacts →
	Indirect evidence “The Functionary helps companies scale operations around the reality of their business, not a standard model.” Source: RevenueBase Database · checked Sep 28, 2026
19	Bayview Technologies, INC	Strong evidence	United StatesHQ checked Sep 28, 2026	1,001-5,000	360 contacts →
	Strong evidence “Bayview Technologies Inc.(“Bayview”) is an IT-enabled business process outsourcing company that provides a variety of customer support, back office and information technology…” Source: RevenueBase Database · checked Sep 28, 2026
20	Sellbytel Group	Partial evidence	Nuremberg, GermanyHQ checked Sep 28, 2026	5,001-10,000	359 contacts →
	Partial evidence “The SELLBYTEL Group is one of the worldwide leading outsourcing specialists and part of Webhelp.” Source: RevenueBase Database · checked Sep 28, 2026
21	The Connection Contact Center	Indirect evidence	Bloomington, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	354 contacts →
	Indirect evidence “For over 35 years, The Connection has made a name for ourselves becoming one of the top industry partners to Fortune 500 companies looking to outsource their contact center…” Source: RevenueBase Database · checked Sep 28, 2026
22	FTO	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 28, 2026	1,001-5,000	348 contacts →
	Partial evidence “FTO™ completes four types of work, namely customer engagement, data entry and acquisition, help desk and tech support, and back-office support.” Source: RevenueBase Database · checked Sep 28, 2026
23	Onbrand24	Partial evidence	Iowa City, United StatesHQ checked Sep 28, 2026	1,001-5,000	346 contacts →
	Partial evidence “As a distinguished global leader in call center outsourcing, OnBrand24 takes pride in its 30-year legacy of delivering exceptional inbound and outbound call center services across…” Source: RevenueBase Database · checked Sep 28, 2026
24	Transact Global	Strong evidence	Bangalore, IndiaHQ checked Sep 28, 2026	1,001-5,000	340 contacts →
	Strong evidence “We specialize in end-to-end outsourcing across all industries and functions, including: Customer Support & Call Center Inbound/outbound call handling, technical support, live…” Source: RevenueBase Database · checked Sep 28, 2026
25	Onepilot	Strong evidence	Paris, FranceHQ checked Sep 28, 2026	1,001-5,000	328 contacts →
	Strong evidence “At Onepilot, we’re redefining Customer Support Outsourcing by blending cutting-edge AI, seamless tech integrations, and real human expertise.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: email support outsourcing services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names email support outsourcing services.
Partial evidence: Its own public description names part of email support outsourcing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name email support outsourcing services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 2,721 email support outsourcing services worldwide

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Email support outsourcing services worldwide at a glance

As of Sep 28, 2026

8.1%Verified-email coverage

23.3Average contacts per company

11-50Median size (employees)

3.5%Largest-city concentration · Lahore

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

816

11-50

1,020

51-200

573

201-500

173

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among email support outsourcing services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for email support outsourcing services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “email support outsourcing services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names email support outsourcing services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among email support outsourcing services, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 5,158 across the full list. 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 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Email support outsourcing services by location

14 lists · largest first

Every Email support outsourcing services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Email support outsourcing services based in London, United Kingdom49

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names email support outsourcing services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many email support outsourcing services are there worldwide?

RevenueBase identified 2,721 email support outsourcing services worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Emtelco S.A, headquartered in Medellin, tops this list with the largest team on record.

Which country has the most email support outsourcing services?

The United States leads with 414 companies, followed by India (374) and Pakistan (233). Every email support outsourcing services list by country and city is linked on this page.

Which city has the most email support outsourcing services?

Lahore leads with 95 headquartered companies, followed by London (49) and Rawalpindi (31).

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 5,158 verified decision-maker contacts tracked across these 2,721 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 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 Smart Search, 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.