JDP wrote:
relay_recipient_maps = hash:/etc/postfix/relay_recipients This is interesting; how to I tell Postfix to check the internal mailserver (Exchange) for address verification?
Postfix has many options - what service does Exchange make available for this? You could turn the above into a mysql lookup for instance.
This should give you a working installation without any whistles and bells. If you don't have a list with valid addresses then you either need to extract it (use an automated script later), use address verification ( postfix asks the internal server if the address is valid), This is very promising. How does this work against an Exchange server?
Just curious - it sounds like you're looking for to front-end your Exchange server with a postfix ditto? /Per Jessen, Zürich