I am simply just transferring over one user for the purposes of testing and mail flow testing. Outgoing is OK on the Exch2k10 server, but all incoming emails to the user gets caught in the 'Messges with an Unreachable Destination' queue on the
Exch2k3 server. The installation was seamless, I installed SP2 then RU4. Confirmed Client and Default settings were right, then create the Internet send connector....then moved over the user. Any ideas would be appreciated, thanks in advance.
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