What is the best practice when one has to implement this sort of ruleset in postfix: Email sent from local domain1.com, domain2.com to example.com, example1.com ought to be relayed to smtp.external.com. Email sent to everyone else @example.com and example1.com ought to be relayed locally I know there is a way to do a relay filtering recipient address using transport_maps, but I do not know how to filter depending on the sender address too. Can you help me please?? Thanks in advance
Add sender_dependent_relayhost_maps = hash:/etc/postfix/relayhost_map to postfix, create /etc/postfix/relayhost_map: @example.com [relay.server.com] [email protected] [relay.server.com] and postmap this file. Afterwards reload postfix. Every mail sent from @example.com will be relayed to relay.server.com
Thank you very much for your answer. But this only filters out sender emails. In my case I want to relay from @domain1.com to @example1.com only. All other conditions are filtered locally.
transport_maps = hash:/etc/postfix/transport /etc/postfix/transport: recipient-domain smtp:[relay.com] postmap /etc/postfix/transport postfix reload
So the following would work as I comment? - Messages from [email protected] to [email protected] => Using relay.server.com - Rest of messages from [email protected] to other domains => Using localhost - Messages from [email protected] => Using localhost /etc/postfix/relayhost_map @domain1.com [relay.server.com] /etc/postfix/transport: @example1.com smtp:[relay.server.com] postmap /etc/postfix/relayhost_map postmap /etc/postfix/transport postfix reload
