Markus E.:
> On Wed, 10 Mar 2021, Wietse Venema wrote:
>
> > Markus E.:
> >> Hello!
> >>
> >> I just noticed my servers replies with a 454 (instead of 554) when a bot
> >> checks for an open relay. Here's one exameple:
> >>
> >> Mar 10 08:53:46 mx1 postfix/smtpd[16747]: connect from
> >> xxx.fesersglobal.com[45.85.90.xxx]
> >> Mar 10 08:53:51 mx1 postfix/smtpd[16747]: NOQUEUE: reject: RCPT from
> >> xxx.fesersglobal.com[45.85.90.xxx]: 454 4.7.1 <spam...@tiscali.it>: Relay
> >> access denied; from=<spam...@tiscali.it> to=<spam...@tiscali.it>
> >> proto=ESMTP helo=<WIN-CLJ1B0GQ6JP>
> >> Mar 10 08:53:52 mx1 postfix/smtpd[16747]: disconnect from
> >> xxx.fesersglobal.com[45.85.90.xxx] ehlo=1 mail=1 rcpt=0/1 rset=1 quit=1
> >> commands=4/5
> >>
> >
> > smtpd_relay_restrictions, I presume?
> >
> > Wietse
> >
>
> Hi Wietse and others,
>
> smtpd_relay_restrictions is emty, i.e. using the defaults.
The default is NOT EMPTY since 2015. That is six years now,
Wietse
