WebprodsPT: > Hello, > > I am the administrator of a Postfix setup with multiple domains, > multiple IP addresses and SSL configured and up and running. Everything > was configured by myself and I have no restrictions on the mail server > machine so basically I can do whatever you suggest. > > Today I received a new requirement and I'm not being able to configure > it, even after reading lots of resources around the web. Email messages > for each separate domain must be sent FROM their respective IP address.
As documented, using "-o smtp_bind_address" with smtpd(8), the mail receiving program, has no effect whatsoever. This feature has effect only on smtp(8), the mail sending program. You may kludge something with sender_dependent_default_transport_maps, choosing an appropriate SMTP client depending on the sender address, each SMTP client having its own "-o smtp_bind_address" setting. That obviously does not work for delivery status notifications which, as required by RFC, have the null sender address. The proper solution is to use one POSTFIX INSTANCE per domain/IP address. See http://www.postfix.org/MULTI_INSTANCE_README.html Wietse
