--- Noel Jones <njo...@megan.vbhcs.org> schrieb am Fr, 15.4.2011:
> Von: Noel Jones <njo...@megan.vbhcs.org> > Betreff: Re: Filtering incoming mails with sender-domain = recipient-domain? > An: postfix-users@postfix.org > Datum: Freitag, 15. April, 2011 05:38 Uhr > On 4/15/2011 4:14 AM, Jannis > Kafkoulas wrote: > > Hi, > > > > Sometimes we receive mails with sender-domain our > company, > > i.e. from: any...@mycompany.com > to: some...@mycompany.com > which we'd like to block (the entire domain). > > Can it be done e.g. by header checks? > > Or is it possible at all? > > You can block mail from the outside that has your domain as > the envelope sender. This will have a fairly low (but > non-zero) false positive rate. > > You should not block mail from the outside that has your > domain in the From: header. This will have a high > false positive rate. > > To block your domain in the envelope, use something like: > > # main.cf > smtpd_recipient_restrictions = > permit_mynetworks > #uncomment next line if using SASL > # permit_sasl_authenticated > reject_unauth_destination > check_sender_access hash:/etc/postfix/sender_access > ... other local rules ... > > > # sender_access > mydomain REJECT mydomain not allowed in > unauthenticated mail > > > > > -- Noel Jones >
