I setup my POP3 email domains to forward to exchange so my users wouldn't have to use POP3 to retrieve mail into there exchange mail. I have 2 domain users (domain1.com and domain2.com) that are coming into my exchange server now on a single Virtual SMTP. They are currently being forwarded from my external SMTP server to my exchange server.
I have each user configured with the correct send domain and there emails are being received by the outside world with the correct reply to Domain.
My domain is behind a managed firewall with NAT. When users send out of exchange, the firewall IP becomes the IP it appears the email is coming from resulting in a reverse DNS failure. I would like to keep my external SMTP the same.
Can I configure exchange such that domain1.com email sent will go through my external domain1.com smtp and domain2.com email sent will go through my external domain2.com smtp? I am assuming this is a SMTP connector function but need a little guidance in configuration.