I'm running Postfix as my front-end MTA with Exchange 2010 behind it and I'm
trying to determine the best way to verify recipients on inbound mail. I like
the simplicity of using the built in verify functionality in Postfix, but when
I put warn_if_reject reject_unverified_recipients into my
smtpd_recipient_restrictions, I get a verify database that contains valid
accounts and a bunch of invalid ones and nothing warns on rejects in the
maillog. I've configured Exchange to reject senders not in the address book,
but it looks as though Postfix is not getting a good verification. I've
telnetted from the Postfix server to Exchange and confirmed that I get a reject
when I attempt to specify a RCPT TO that is not a valid address. How do I go
about troubleshooting what server Postfix is verifying against. The Exchange
servers are the next hop as specified in the transport map. I've reviewed the
ADDRESS_VERIFICATION_README, but am not finding what I need to troubleshoot
this issue there. What else do I need to be doing here?
Thanks very much for any assistance
Rob
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