On Thu, Jan 17, 2013 at 5:28 AM, Wietse Venema <[email protected]> wrote:
> host = computer (operating system on top of real or virtual hardware) > MTA = postfix > > The text in main.cf assumes that both non-fallback and fallback > MTA run on the same host and that they send mail from the same > source IP address. You could for example: > > - Configure both MTAs to use the same smtp_bind_address. > > - Configure each MTA with its own IP address and play with NAT. > Could this be achieved with a single instance of Postfix on one host machine configured for 2+ virtual domains with the same domain name ( mailer1.example.com, mailer2.example.com, etc.), or would it need to be two separate instances of Postfix running on the same host? Regardless, if they two MTAs used the same smtp_bind_address, wouldn't that mean that only one of them would match the host's reverse DNS lookup, and that the other would have mail rejected by remote hosts that verify the reverse IP matches the sending IP?
