Nikolaos Milas:
> Sep 8 09:35:37 mailgw1 postfix/smtpd[18791]: NOQUEUE: reject: RCPT from
> mail.ipta.demokritos.gr[143.233.230.2]: 450 4.7.1 <Symantec.local>: Helo
> command rejected: Host not found;
> from=<someu...@ipta.demokritos.gr> to=<ouru...@noa.gr> proto=ESMTP
> helo=<Symantec.local>
I don't recommend using reject_unknown_helo_hostname, because there are
many false positives.
> 3. If we are supposed to remove these restrictions, which settings
> should we remove from our config to resolve the problem? Should we
> remove all of: reject_unknown_helo_hostname,
> reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname ?
I'd use none of these. reject_unknown_helo_hostname and
reject_non_fqdn_helo_hostname have many false positives. It's for
fanatics who receive very little email. reject_invalid_helo_hostname
doesn't stop much because spambots have evolved.
Wietse
