Company lists · Data verified August 2026
Top 12 Email deliverability tools based in the United Kingdom
There are 40 email deliverability tools headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 176 professional contacts across them, including 50 with verified work emails and 6 with mobile numbers. London is the largest hub.
This list covers email deliverability tools headquartered in the United Kingdom, 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.
The 12 largest email deliverability tools based in the United Kingdom
Ranked by team size| # | Company | Verified emails |
|---|---|---|
| 1 |  Mailercloud | 12 |
| 2 |  Folderly INC | 11 |
| 3 |  Silk Email | 3 |
| 4 |  Allegrow | 7 |
| 5 |  Mailxpertise | 6 |
| 6 |  Email Blaster UK | 3 |
| 7 |  Mailyser | 3 |
| 8 |  247emaildata | 1 |
| 9 |  Quinset | 1 |
| 10 |  Magicals | 1 |
| 11 |  Inboxwizards | 1 |
| 12 |  RED Circle Digital | 1 |
Showing 12 of 40 email deliverability tools based in the United Kingdom
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Email deliverability tools based in the United Kingdom at a glance
As of Aug 28, 2026Companies by employee count
Email deliverability tools by metro
| Metro | Companies |
|---|---|
| Email deliverability tools in London | 19 |
| Email deliverability tools in Cambridge | 1 |
| Email deliverability tools in Manchester | 1 |
| Email deliverability tools in Christchurch | 1 |
| Email deliverability tools in Glasgow | 1 |
| Email deliverability tools in Greenfield | 1 |
| Email deliverability tools in Burcote | 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 deliverability tools”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
- 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; 1 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 deliverability tools are there based in the United Kingdom?
There are 40 email deliverability tools headquartered in the United Kingdom as of August 2026 (RevenueBase).
What is the largest company on this list?
Mailercloud, headquartered in London, tops this list with the largest team on record.
Which city has the most email deliverability tools?
London leads with 19 headquartered companies, followed by Cambridge (1) and Manchester (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 50 verified decision-maker contacts tracked across these 40 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.
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