post...@ptld.com: > > By default, Postfix does not care how a client discovers an MTA > > (which MX record was used, if any, etc.). > > Oh, did i misunderstand this part? > It is possible for postfix to know what domain MX the client used > to get the IP?
By default, Postfix does not care.
You can configure DNS to associate distinct sets of IP addresses
with each email domain, and reject email from a client that connects
to a 'wrong' IP address, but that is entirely optional.
Wietse
