Shipvane · 4 AE roles
Marco E. · joined Cargolio
Fleetora · first roles in DECompanies using 21cn mail_
As of 4 November 2026, 98 companies carry 21cn mail 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
- China · 60 companies
- Companies with 51+ staff
- 70 · 71% of the footprint
- Top industry
- Manufacturing & industry · 78%
- Team that names it most
- –
- Hiring on it, last 30 days
- 0 companies
- Most often alongside
- –
Where 21cn mail 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 21cn mail's scripts or embeds, or whose domain's mail and hosting records (SPF, DKIM, MX, CNAME) point at 21cn mail. 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 21cn mail. 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 21cn mail. The rest of the posting population (0) runs 21cn mail without a public trace on the site or in DNS, which is where job data earns its place.
Companies on 21cn mail
No company names 21cn mail 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 21cn-mail 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 98 companies with 21cn mail on their website or in DNS. Click a country for its own page where we have one.
| companies | share | |
|---|---|---|
| China | 60 | 61% |
| United States | 31 | 32% |
| United Kingdom | 3 | 3% |
| Canada | 1 | 1% |
| India | 1 | 1% |
| Japan | 1 | 1% |
| VN | 1 | 1% |
| companies | share | |
|---|---|---|
| Self-employed | 3 | 3% |
| 2-10 employees | 10 | 10% |
| 11-50 employees | 15 | 15% |
| 51-200 employees | 53 | 54% |
| 201-500 employees | 14 | 14% |
| 501-1000 employees | 2 | 2% |
| 1001-5000 employees | 1 | 1% |
| companies | share | |
|---|---|---|
| Manufacturing & industry | 76 | 78% |
| Automotive | 9 | 9% |
| Commerce & trade | 7 | 7% |
| Business & finance services | 2 | 2% |
| Health care | 1 | 1% |
| Property & construction | 1 | 1% |
| Technology & software | 1 | 1% |
| Utilities & infrastructure | 1 | 1% |
The mail, hosting and web stack of 21cn mail 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.
98 companies carry 21cn mail 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/21cn-mail)
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 21cn mail 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.
21cn mail data: questions
How many companies use 21cn mail?
98 as of 4 November 2026: 98 carry 21cn mail 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 21cn mail'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 21cn mail. 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 21cn mail, 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 98 with verified e-mails and a weekly feed of new 21cn mail 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 21cn mail,
with the person who owns it
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