security.txt (RFC 9116) in Email hosting
It tells a researcher where to report a vulnerability instead of guessing.
8 of 15 vendors we measured here publish it, that is 53%. Last checked 2026-09-03.
53% here against 13% across every category we measure. Email hosting sits above the overall share for this criterion.
Back to security.txt (RFC 9116) across all categories, or to Email hosting.
Published
Served at /.well-known/security.txt.
No security.txt found.
We reached at least one address for each of these vendors and none of them carried it. That is what we found at the addresses we checked, on the date we checked them, and not a statement about what the vendor has.
| Vendor | What we found |
|---|---|
| All-Inkl | 1 address checked |
| Biohost | 1 address checked |
| Greensta | 1 address checked |
| Hushmail | 1 address checked |
| Kolab | 1 address checked |
| Mailu | 1 address checked |
| Posteo | 1 address checked |
Not measured
We could not look at these, or their robots.txt asks us not to. That says something about our measurement, not about them, and they are left out of the percentage above.
| Vendor | What we found |
|---|---|
| Alfahosting | None of the addresses could be reached, so this was not measured. |
| Bluehost Mail | The vendor’s server blocked or rate-limited our crawler, so this was not measured. |
Found something we missed? Tell us and the next run picks it up.