On Mon, Aug 22, 2022 at 05:35:54PM +0200, Patrick Proniewski wrote:
> > On 22 Aug 2022, at 17:20, post...@ptld.com wrote:
> >
> > This isn't the complete answer to your problem, but one of the puzzle
> > pieces that might help your situation.
> >
> > smtpd_recipient_restrictions = reject_non_fqdn_sender
> > http://www.postfix.org/postconf.5.html#reject_non_fqdn_sender
>
> But the "loophole" here is that blank sender/return-path is allowed
> (MAILER DAEMON), I could prohibit that, but with huge caveats.
Best to ignore bad advice. You may need a better antispam filter. Ad
hoc rules for past (and plausibly never again) abuse are not likely to
be effective. That said, no antispam filter is 100% effective. Some
spam *will* get through no matter what you do.
--
Viktor.
