Company lists · Data refreshed September 2026
Top 12 Managed email security providers based in the United Kingdom
RevenueBase identified 39 managed email security providers headquartered in the United Kingdom as of September 2026 and tracks 192 professional contacts across them, including 63 with verified work emails and 11 with mobile numbers. London is the largest hub.
This list covers managed email security providers headquartered in the United Kingdom, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 12 largest managed email security providers based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Mailock By Beyond EncryptionStrong evidence | 15 | |||
“Deliver sensitive information by email with recipient-first security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 13 | ||||
“Established in Bloxx is a true pioneer in the development and support of sophisticated Email and Web filtering technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 12 | ||||
“StayPrivate Email as it should be.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 6 | ||||
“Prolateral Consulting Ltd was founded in 2003 with its head office based in Luton, UK.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Power Play Cold Email InfrastructurePartial evidence | 6 | |||
“Unlock unprecedented growth with Power Play's revolutionary email strategies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 4 | ||||
“Businesses today are faced with a multitude of IT security threats that can have a serious impact on their bottom line.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 3 | ||||
“About Us: At Mailyser, we are passionate about helping businesses and individuals maximize their email marketing potential.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | gov-email.ukStrong evidence | 3 | |||
“Helping public organizations-send authenticated and trusted email -distribute email newsletters, bulletins and news-blasts quickly and efficiently -recipients to manage their…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 2 | ||||
“WizEmail is an email marketing company formed by marketing specialists totalling decades of years experience in the direct marketing, internet and publishing sectors.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1 | ||||
“Full migration from existing ESP to Klaviyo Account setup + Essential flows A/B testing and optimisation Flows overhaul Campaign content Monthly reporting and strategy Quarterly…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1 | ||||
“InboxWizards help small to large email senders deliver their emails to the Inbox.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1 | ||||
“Pie Security helps organisations to implement email security and encryption solutions that provide assurances that your email communication between customers and suppliers is…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 12 of 39 managed email security providers based in the United Kingdom
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Managed email security providers based in the United Kingdom at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 managed email security providers, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United Kingdom whose own description of what they do matches “managed email security providers”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among managed email security providers, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
- 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 an evidence 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, 63 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 5, 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.
Frequently asked
How many managed email security providers are there based in the United Kingdom?
RevenueBase identified 39 managed email security providers headquartered in the United Kingdom 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?
Mailock By Beyond Encryption, headquartered in Fareham, tops this list with the largest team on record.
Which city has the most managed email security providers?
London leads with 14 headquartered companies, followed by Cambridge (1) and Carrickfergus (1).
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 63 verified decision-maker contacts tracked across these 39 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 5, 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.
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