Warming up
Transactional email API
4,340 software, SaaS and IT companies in the UK publish an email address on their own website, as of September 29, 2026. 10% name London on their website, more than any other UK city, and WordPress runs on 50% of their websites.
Searching is free. You only spend allowance when you export.
Counted by the city each company's own website names. London leads with 443; a company that names two cities counts in both.
| London | 443 (10%) |
|---|---|
| Manchester | 57 (1%) |
| Glasgow | 38 (under 1%) |
| Bristol | 35 (under 1%) |
| Leeds | 27 (under 1%) |
| Birmingham | 25 (under 1%) |
| Sheffield | 23 (under 1%) |
| Edinburgh | 22 (under 1%) |
| Nottingham | 21 (under 1%) |
| Liverpool | 15 (under 1%) |
Of the 742 that print a Companies House number, 96% are registered in England and Wales, 4% are registered in Scotland and under 1% are registered in Northern Ireland.
Every company here publishes an email address. These are the other routes and signals their websites carry.
A second route for when email goes unanswered.
Growing firms buy more. A useful first filter.
Who hosts their email decides which spam filter reads your message. What their site is built on says what else they already pay for.
| Microsoft 365 | 1,328 (31%) |
|---|---|
| Google Workspace | 802 (18%) |
| Self-hosted | 486 (11%) |
| Hostinger | 128 (3%) |
| Other or unknown | 1,596 (37%) |
Read from each domain's public MX record. If most of your list is on one provider, warm up a mailbox on that provider first. Filter by provider in the lead finder.
Share of these companies whose homepage loads each technology. Google Analytics is left out because nearly everyone runs it.
797 of them (18%) state a founding year on their site. This is how those split.
| Before 1980 | 13 (2%) |
|---|---|
| 1980 to 1999 | 147 (18%) |
| 2000 to 2009 | 283 (36%) |
| 2010 to 2014 | 98 (12%) |
| 2015 to 2019 | 171 (21%) |
| 2020 or later | 85 (11%) |
Only 123 (3%) say how many people they employ, so read this as a shape, not a census.
| Solo | 11 (9%) |
|---|---|
| 2–10 | 27 (22%) |
| 11–50 | 44 (36%) |
| 51–200 | 23 (19%) |
| 201–500 | 9 (7%) |
| 501–1,000 | 3 (2%) |
| 1,001–5,000 | 5 (4%) |
| 10,000+ | 1 (under 1%) |
What we have learned about emailing software, SaaS and IT companies. The numbers above tell you how many there are; this is how to get a reply.
Software buyers expect a self-serve path and a clear price. Put the price or the free tier in the email, and show one concrete integration or metric instead of a list of features.
Hi [first name], saw [company] just launched [feature]. When teams at your stage start outbound, the first thing that breaks is usually deliverability on the new domain. Happy to share what the first 30 days should look like if useful.
Replace the bracketed parts per company. In a Warmerly campaign they fill from the lead's own fields.
Tuesday to Thursday. Many teams run sprint planning on Monday and release on Friday.
Warmerly's lead database holds 4,340 software, SaaS and IT companies in the UK that publish an email address on their own website, counted on September 29, 2026. That is not every such business in the country. It is the ones whose site we crawled and that list a way to contact them by email, which is the number that matters for outreach.
Microsoft 365 runs email for 31% of them, followed by Google Workspace at 18%. It is read from each domain's public MX records. It matters for cold email because Google and Microsoft filter differently, so a sending mailbox on the same provider as most of your list is worth warming up first.
London, named by 443 of them, then Manchester (57) and Glasgow (38). The count is companies whose website names the city, so one business can appear under more than one.
Yes. Searching the database in Warmerly is free, and you see the same count as this page before spending anything. Exporting or adding companies to a campaign uses your plan's monthly lead allowance. Every result is a business contact route the company publishes itself, and any company that has asked to be removed is excluded. This page shows totals only, never individual companies.
Filter them by size, founding year, technology and hiring, see what each record holds, then send from warmed-up mailboxes in the same tool.
