> -----Original Message-----
> From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org>
> On Behalf Of Gerald Galster
> Sent: Monday, July 27, 2020 6:47 AM
> To: Postfix users <postfix-users@postfix.org>
> Subject: Re: smtpd_recipient_restrictions Failure?
>
>
> > Lately I've been getting email sent from one persistent spammer that's
> > somehow getting through my smtpd_recipient_restrictions filters. Here
are
> > the message headers:
> >
> > Return-Path: <MAILER-DAEMON>
> [...]
> > From:=?UTF-8?B?RGVybWFDb3JyZWN0?=<i...@....xyz>
> [...]
> > smtpd_recipient_restrictions =
> > check_sender_access hash:/etc/postfix/blacklist_hash,
>
> http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions
>
> smtpd_sender_restrictions like check_sender_access check the
> envelope_sender (MAIL FROM smtp command / Return Path) which is not
> necessarily the same as the From: header.
>
> In your example the null sender ("", <>, MAILER-DAEMON) is searched,
> not i...@....xyz.
>
> Best regards
> Gerald
Thanks, Gerald. I also have this in my main.cf configuration file:
smtpd_sender_restrictions =
permit_mynetworks,
reject_non_fqdn_sender,
reject_unknown_sender_domain,
check_client_access cidr:/etc/postfix/blacklist_cidr,
permit
Shouldn't the reject_non_fqdn_sender or reject_unknown_sender_domain
restrictions have caught this?
Scott
