On Fri, 7 Aug 2026 19:35:01 +0200 Jaroslaw Rafa via Postfix-users <[email protected]> wrote:
> Dnia 7.08.2026 o godz. 18:14:45 Joe via Postfix-users pisze: > > Is there, by the way, a method of filtering in Postfix based > > on the sending server name i.e. its PTR record? > > You can do this with smtpd_client_restrictions. > > > I could do this in > > exim4, but the filtering in Postfix seems based on the alleged > > sender name taken from the headers. > > Postfix does not filter on headers. That's what milters can do. Sorry, badly put. It appears as a separate header, while the sender PTR appears only in a Received: header. I am old enough to have sent test emails by hand using Telnet, when that was still possible. > > smtpd_sender_restrictions filters on sender address taken from *SMTP > transaction* (MAIL FROM: command), not from headers. > > > I'd prefer to dispose of > > xxx.goggleusercontent.com in one go, rather than a long list of CIDR > > blocks. > > My table referenced in smtpd_client_restrictions contains > > bc.googleusercontent.com REJECT > > and it works well for rejecting mail from all > *.bc.googleusercontent.com clients. Thanks, I've finally done it and caught an entry in the log today, works perfectly. I did think it must be possible, I'm just not used to thinking of email senders as 'clients'. -- Joe _______________________________________________ Postfix-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
