In my case, I reject invalid HELO names with:
reject_invalid_helo_hostname reject_non_fqdn_helo_hostname I've run postfix like this for about 10 years now without any problems. I don't expect others to use such restrictions but it works for me. On Fri, 23 Dec 2022 09:51:48 +0400 Samer Afach <samer.af...@msn.com> wrote: > I see. Thank you for the explanation. So the right way to state this is > that HELO/EHLO requires a valid FQDN/hostname only for MTAs, and for > MUAs it's just ignored because authentication is what matters. > > Cheers, > Sam
