starred/kumomta
1
0
Fork 0
mirror of https://github.com/KumoCorp/kumomta.git synced 2026-10-03 16:00:31 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
dependabot/github_actions/github-actions-540b05cf07
kumomta/docs/glossary/null-mx.md
T

348 B
Raw Permalink Blame History

Null MX

A null MX record (RFC 7505) declares in DNS that a domain never accepts email, using a single MX record with priority zero and a "." target. Publishing it lets sending servers fail immediately instead of retrying for days against a domain with no mail service, and it keeps non-mail domains from being useful in forged bounce addresses.

Reference in New Issue View Git Blame Copy Permalink