So, in main.cf:
smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated,
reject_unknown_client_hostname, reject_unknown_sender_domain,
regexp:/etc/postfix/sender-regex
in sender-regex:
/racknerd\.com/ reject
will this be working?
Thanks
August 7, 2025 at 4:33 PM, "Ralph Seichter via Postfix-users"
<postfix-users@postfix.org
mailto:postfix-users@postfix.org?to=%22Ralph%20Seichter%20via%20Postfix-users%22%20%3Cpostfix-users%40postfix.org%3E
> wrote:
>
> * Corey via Postfix-users:
>
> >
> > SRS0=5MgR=s2=racknerd.com=supp...@pobox.be
> > mailto:SRS0=5MgR=s2=racknerd.com=supp...@pobox.be reject
> >
> > This is not useful since the part of "SRS0=5MgR=s2" changes every time.
> >
> https://www.postfix.org/regexp_table.5.html should get you started.
> Regular expressions for the win. ;-)
>
> -Ralph
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