Wietse Venema put forth on 6/11/2010 9:21 AM: > 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.
Thanks Wietse. For some reason I'd always assumed it was a little more sophisticated than that. But as you point out, and upon reflection, it seems it'd be pretty difficult to code this level of sophistication into the fqdn checking. -- Stan
