Viktor Dukhovni via Postfix-users:
> On Sun, Jun 16, 2024 at 10:06:41AM -0400, Wietse Venema via Postfix-users
> wrote:
> > John R. Levine via Postfix-users:
> > > On Sat, 15 Jun 2024, Jeff Peng wrote:
> > > > I think postscreen can block them easily.
> > >
> > > I'm looking at the postscreen man page and I don't see anything about
> > > mail
> > > addresses. Am I missing something?
> >
> > That is a bad suggestion, please ignore.
> >
> > > I do see smtpd_command_filter. How about if I map MAIL FROM:<badname> to
> > > QUIT?
> >
> > That would do the job. With regexp: or pcre: tables you may save
> > some CPU cycles with:
> >
> > # Don't indent text between IF and ENDIF.
> > IF /^MAIL FROM:/
> > /^MAIL FROM:<badstuff>/ QUIT
> > /^MAIL FROM:<badstuff>/ QUIT
> > ...
> > ENDIF
>
> What's wrong with simple literall access(5) checks on the envelope
> sender, one then also gets to log the rejected recipients assuming the
> default setting of "smtpd_delay_reject = yes".
True as a more general solution, but I don't think
that is required here.
> Regular expressions are much too fragile in the hands of most users.
I think that John has the competence to make that decision.
Wietse
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