Hello all, thanks a lot for all answers.
It seems I have to use SPF or DMARC to get what I want. Unfortunately these components are not integrated in the SuSE Linux software distribution. I'd like to use only the onboard resources postfix, amavis-new with DCIM, spamassassin because of automatic updating. Is there actually no way in amavis (or spamassassin) to reject/quaratine mails from a specific sender with no or an invalid DKIM signatur? Is there any way to reject those mails in postfix after amavis DKIM verifying? I've allready tried to check the headers in postfix for DKIMs "Authentication-Results", but "header_checks" take place before the DKIM verification and "smtp_header_checks" do not allow to cutoff the mail delivery. Hope anyone can help me best regards Gerhard >>> Maurizio Marini <[email protected]> schrieb am Mittwoch, 13. Januar >>> 2016 um 12:27 in Nachricht <[email protected]>: > On Wed, 13 Jan 2016 12:01:52 +0100 > "Gerhard Rappenecker" <[email protected]> wrote: > >> My intention is, to reject mail from outside with a faked sender adress >> of our own domain. In the past we were attacked by such mails to our >> mailinglists. > Hello Gerhard > I use spf with -all instead of ~all to do exactly what you want. > I do not received anymore spam with my domain in from address > I mean: @datalogica.com > -m
