If I have setup this: smtpd_sender_restrictions = reject_sender_login_mismatch
does it work? Thank you > Gesendet: Dienstag, 06. Dezember 2022 um 09:33 Uhr > Von: "Benny Pedersen" <m...@junc.eu> > An: postfix-users@postfix.org > Betreff: Re: sender issue with sasl user > > linux...@gmx.net skrev den 2022-12-06 02:06: > > > I found that when a sasl user passed the authentication, it can send > > email with any sender address, not only the sasl user itself. > > > > This may cause our mailsystem to be abused. > > > > How can I setup postfix to stop this behavior? > > do you belive strongly that the From: header always is the sasl user > abusing ? > > if so change sasl user password and wait for custommers to confirm :) > > that sayed there is only little postfix can do with it, as all other say > if you want to make it stronger, it needs milters for this to happend > > https://serverfault.com/questions/640756/postfix-login-mismatch-sender-address-rejected >
