Stan Hoeppner:
> Does Postfix consider "architettobellucci.com" an FQDN? I've always
> understood an FQDN as requiring all 3 of host.domain.tld. If my understanding
> of FQDN is correct, then a spam slipped through that I believe should have
> been rejected by reject_non_fqdn_helo_hostname. What have I configured
> incorrectly that allowed this spam through?
Postfix's reject_non_fqdn_mumble features were intended to stop
hosts that announce themselves by their netbios name (e.g., HELO
OEMCOMPUTER).
Postfix does not know where the registration boundaries are (.com
and .org versus .co.uk and .ac.jp). Thus it uses the simplistic
"does the name contain at least one dot". This is by no means
bullet-proof with hosts (or domains) at the top level.
Wietse
