Marco Giardini: > I have a barracuda server that receives mails, filter them and forward to a > linux system running postfix. > > Both machine have a public IP (static). > > The linux system is configured to be used as SMTP for sasl authenticated > users as well, besides to be used as SMTP for the people on $mynetworks > (permit_mynetworks in the smtpd_recipient_restrictions). > > Unfortunatley, some spammers, have found it and use to spam local recipients > using the linux machine, avoiding so to be filtered through the barracuda > system. > > I'm wondering if there is a way to allow OLNY local users or users belonging > to the domains hosted by the linux server to use SMTP.
To permit only local systems (incl. barracuda box), or users that have a relationship with your server: smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject Wietse