4 ms·
That's a "null MX", indicating that the domain does not accept mail. https://datatracker.ietf.org/doc/html/rfc7505 https://datatracker.ietf.org/doc/html/rfc750
by oftenwrong 5y ago
That's a "null MX", indicating that the domain does not accept mail.
https://datatracker.ietf.org/doc/html/rfc7505 https://datatracker.ietf.org/doc/html/rfc7505
- psim1 5y agoThanks! That RFC is new to me.