Companies using maileroo
As of 4 November 2026, 2,766 companies carry maileroo on their website or in their DNS records; none names it in job postings yet.
As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
- Largest market
- United States · 888 companies
- Companies with 51+ staff
- 98 · 4% of the footprint
- Top industry
- Technology & software · 25%
- Team that names it most
- –
- Hiring on it, last 30 days
- 0 companies
- Most often alongside
- –
Where maileroo 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 maileroo's scripts or embeds, or whose domain's mail and hosting records (SPF, DKIM, MX, CNAME) point at maileroo. 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 maileroo. Read hourly from ~70 applicant tracking systems, with the function, a quote and a date. Intent: the team that runs it is hiring.
Companies in the footprint whose postings also name maileroo. The rest of the posting population (0) runs maileroo without a public trace on the site or in DNS, which is where job data earns its place.
Companies on maileroo
No company names maileroo in its job postings with enough confidence to list yet; the companies below carry it on their website or in DNS.
Companies with 1,000+ employees whose website or DNS carries maileroo but whose postings never name it: the part of the market job data alone misses.
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By country, company size and industry
The 2,766 companies with maileroo on their website or in DNS. Click a country for its own page where we have one.
| companies | share | |
|---|---|---|
| United States | 888 | 32% |
| Netherlands | 339 | 12% |
| United Kingdom | 192 | 7% |
| Australia | 146 | 5% |
| United Arab Emirates | 120 | 4% |
| Canada | 110 | 4% |
| Spain | 73 | 3% |
| Germany | 69 | 2% |
| France | 66 | 2% |
| Brazil | 64 | 2% |
| Belgium | 55 | 2% |
| Romania | 46 | 2% |
| companies | share | |
|---|---|---|
| Self-employed | 1,427 | 52% |
| 2-10 employees | 722 | 26% |
| 11-50 employees | 457 | 17% |
| 51-200 employees | 70 | 3% |
| 201-500 employees | 17 | 1% |
| 501-1000 employees | 6 | 0% |
| 1001-5000 employees | 5 | 0% |
| companies | share | |
|---|---|---|
| Technology & software | 681 | 25% |
| Business & finance services | 349 | 13% |
| Media & content | 322 | 12% |
| Consumer services & leisure | 316 | 11% |
| Commerce & trade | 266 | 10% |
| Property & construction | 213 | 8% |
| Manufacturing & industry | 144 | 5% |
| Public, community & associations | 119 | 4% |
| Health care | 87 | 3% |
| Hospitality & travel | 81 | 3% |
| Transport, logistics & rental | 51 | 2% |
| Automotive | 50 | 2% |
The mail, hosting and web stack of maileroo companies
Other tools found on the same companies' websites or in their DNS records. Mail providers and senders come from SPF, DKIM and MX; the rest from page code.
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
2,766 companies carry maileroo on their website or in their DNS records; no company names it in its job postings yet. (Breaknorm, 4 November 2026, https://breaknorm.co/tools/maileroo)
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 maileroo 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.
maileroo data: questions
How many companies use maileroo?
2,766 as of 4 November 2026: 2,766 carry maileroo 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 maileroo'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 maileroo. 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 maileroo, 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 2,766 with verified e-mails and a weekly feed of new maileroo users is in the product. Counting is free.
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Every company on maileroo,
with the person who owns it
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