Ignacio Garcia wrote: > Hi there. > > We have a couple of servers handling thousands of messages a day. We > noticed that some of our users will use their autheticated account to > send messages from other valid accounts not sitting in our servers. By > using smtpd_reject_unlisted_sender = yes we solve the problem partially > by not letting users to use an incorrect local email account to send > messages. However, is there a way to prevent local authenticated users > sending email with valid hotmail or gmail accounts through our smtp > servers? We cannot use reject_authenticated_sender_login_mismatch since > some of our business customers have their own intranet email servers > doing smtp authenticated relays. >
You can separate them by using a check_sender_access. Expand or modify to fit your needs Example using pcre table: smtpd_sender_restrictions= ... check_sender_access pcre:/etc/postfix/auth_senders_check ... /etc/postfix/auth_senders_check: /^...@bizcustomer1.example.com$/ DUNNO /^...@bizcustomer2.example.com$/ DUNNO /^/ reject_authenticated_sender_login_mismatch
