Sender dependent relay host map

[alex-ac-ir]

Does it support different servers and credentials depending on login as postfix do?

sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relayhost_map
smtp_sender_dependent_authentication = yes 

[ryanburnette]

This would be nice. I have a use case for it where I am running multiple smtprelay instances, but this would be better.