I'd like to specify a custom return-path on outgoing emails, so that bounces go to a different address where I can examine them programatically.

The emails I send, however, never seem to have a return-path header.  This means that all the bounces come back to the replies mailbox, which is not what I want to accomplish.

Is it possible to change the return-path, and if so, how can I do this?

Thank you!