Here's my problem; may be an easy one for y'all...
I've successffully configured my DNS settings to send and receive, but am still having difficulty resolving the DSN (Failure) Error 5.3.5 - Loopback? All incoming email fails with this error code given.
All of the tests work fine from https://www.testexchangeconnectivity.com/Default.aspx
with the exception of Reverse DNS lookup, which I've contacted my ISP for PTR record changes.
I have MSExchange2k7 on Win2k8... Exchange is hosted on srv02.domain.net and the DC is on srv01.domain.net. SMTP Virtual Server is also running on srv02.domain.net.
I have a single SMTP Virtual Server created with two entries under the Domain listing... one points to the Exchange server (same box), includes just a Drop Directory, and the other points to the Domain Name (domain.net) with Allow Incoming Mail to be Relayed and Forward all mail to [IP address].
The single Virtual Server has (All Unassigned) IP address: enabled... I've gone back and forth here with fixed IP to no avail.
I have disabled IPv6 in the network settings. In the Receive Connectors of the Hub Transport node under Server Configuration ((EMC), I have two entries...1) is Client (enabled) and All Available IPv6 and IPv4 assigned on port 587... 2) is the Default with the same Network properties assigned (All Available IPv6 and IPv4) on Port 25.
I'm really at my wits end here trying to chase this down... where should I be looking, and what else should I be doing? I've actually considered deleting the single Virtual SMTP Server and recreating it, but thought better of that till I received some outside advice.
So... advice anyone????
Thanks so much for your time in advance.