Shipvane · 4 AE roles
Marco E. · joined Cargolio
Fleetora · first roles in DECompanies using mailrun_
As of 4 November 2026, 107 companies run cold e-mail outbound on mailrun, read from their sending domains in DNS; 10 added three or more sending domains in the last 30 days.
As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
- Cold-email outbound on it
- 107 companies
- Scaling outbound now (3+ new sending domains, 30 d)
- 10
Where mailrun shows up
Each population is counted on its own. We never add them up without saying so, because they answer different questions.
Companies whose own pages load mailrun's scripts or embeds, or whose domain's mail and hosting records (SPF, DKIM, MX, CNAME) point at mailrun. From our crawl of 41.5M company websites and the DNS sweep behind it. Reach: the tool is in the building.
Companies whose own postings say the team works in mailrun. Read hourly from ~70 applicant tracking systems, with the function, a quote and a date. Intent: the team that runs it is hiring.
Companies whose cold-e-mail sending domains (look-alike domains on mailrun's infrastructure, found in certificate logs and DNS) redirect to them. The strongest outbound signal there is: 10 of them added three or more sending domains in the last 30 days.
Companies on mailrun
No company names mailrun in its job postings with enough confidence to list yet; the companies below carry it on their website or in DNS.
Filter by country, size, team and source, open verified e-mails for the decision makers, or push new matches to your CRM every week.
Free plan: 1,000 records, no card. The first 20 are above; e-mails are verified at the mail server when you open them.
Who runs cold e-mail on mailrun
The 107 companies whose sending domains point at mailrun. Mostly small teams and agencies; the ones scaling right now are the buyers of data, deliverability and enrichment.
| companies | share | |
|---|---|---|
| United States | 81 | 76% |
| United Kingdom | 12 | 11% |
| Netherlands | 4 | 4% |
| Australia | 2 | 2% |
| Germany | 2 | 2% |
| Ukraine | 2 | 2% |
| Estonia | 1 | 1% |
| Spain | 1 | 1% |
| Israel | 1 | 1% |
| Türkiye | 1 | 1% |
| companies | share | |
|---|---|---|
| Self-employed | 26 | 24% |
| 2-10 employees | 28 | 26% |
| 11-50 employees | 38 | 36% |
| 51-200 employees | 13 | 12% |
| 201-500 employees | 2 | 2% |
| companies | share | |
|---|---|---|
| Business & finance services | 48 | 45% |
| Technology & software | 36 | 34% |
| Commerce & trade | 6 | 6% |
| Media & content | 5 | 5% |
| Consumer services & leisure | 4 | 4% |
| Property & construction | 4 | 4% |
| Public, community & associations | 2 | 2% |
| Manufacturing & industry | 2 | 2% |
Filter on outbound_provider and outbound_new_30d_count, open the founder or head of growth with a verified e-mail, or get every newly scaling account each morning.
Free plan: 1,000 records, no card. The first 20 are above; e-mails are verified at the mail server when you open them.
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
107 companies run cold e-mail outbound on mailrun: their sending domains, read from DNS and certificate logs, point at mailrun's infrastructure; 10 of them added three or more sending domains in the last 30 days. (Breaknorm, 4 November 2026, https://breaknorm.co/tools/mailrun)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Website codeScripts, tags and embeds found on the company's own pages in our crawl of 41.5M sites. A tool counts once per company.
- DNS recordsSPF includes, DKIM selectors, MX and CNAME records of the company's domain that point at mailrun or another vendor. Swept in cycles; dedicated mail-provider and hosting facets open once coverage passes 80% per country.
- Job postingsRead hourly from the applicant tracking systems behind company career sites. A tool counts when the employer's own text names it as the team's system; candidate wish-lists and apply boilerplate are excluded. Confidence low, medium or high per company.
- Sending infrastructureCold-e-mail sending domains are look-alike domains on a provider's infrastructure (DNS records, certificate logs) that redirect to the company. Absence is not evidence: only companies with a found sending domain are counted.
- CompaniesCountry, size and industry come from the company profile we build from its website; headcount from LinkedIn where known, otherwise estimated. Job boards, portals and aggregators are kept out of lists.
mailrun data: questions
How many companies use mailrun?
107 as of 4 November 2026: 0 carry mailrun on their website or in their DNS records and 0 name it in their own job postings; 0 show up in both. We keep the two counts apart because they measure different things.
What does "website or DNS" mean?
Our crawler finds mailrun's scripts, embeds and tags on the company's own pages, and our DNS sweep reads the domain's mail and hosting records (SPF includes, DKIM selectors, MX, CNAMEs) that point at mailrun. Either one puts the company in the footprint. The sweep is still running, so this number grows week by week.
Why is the job-posting number so much smaller?
A posting only names a tool when the team that will use it is hiring and chooses to say so. That makes it a smaller but stronger signal: it tells you which team runs mailrun, with a quote and a date. The footprint tells you reach.
How fresh is this?
Career sites are read hourly, websites are re-crawled on a rolling schedule and DNS is re-swept in cycles. The date at the top is when these counts were computed.
Can I get the list?
Yes. The first 20 are on this page; the full 107 with verified e-mails and a weekly feed of new mailrun users is in the product. Counting is free.
Get this list your way
The same data as a search, over MCP and the API, as bulk files, or pushed to you as it changes.
Every company on mailrun,
with the person who owns it
Connect the MCP server or the API, filter on mailrun, and get 1,000 records free.