Dnia 11.08.2022 o godz. 12:56:41 Nick Howitt pisze: > > Oh OK, so when it says "unknown" it only means that forward and reverse DNS > don't match? I was reading it that the reverse DNS didn't exits. > > I can't use reject_unknown_client_hostname as I know at least one major ISP > in the UK has their mailserver announcing a ???.local or ???.lan domain. > Also don't the RFC's require an FQDN as a hostname but it does not > necessarily need to be valid? Or am I thinking of something else?
>From Postfix documentation (http://www.postfix.org/postconf.5.html): reject_unknown_client_hostname (with Postfix < 2.3: reject_unknown_client) Reject the request when 1) the client IP address->name mapping fails, or 2) the name->address mapping fails, or 3) the name->address mapping does not match the client IP address. reject_unknown_reverse_client_hostname Reject the request when the client IP address has no address->name mapping. -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub."
