Existing Exchange 2007 SP3 1 MBX, 2 CAS/HT, 2 ET servers.
I have added an Exchange 2013 server with MBX/CAS role.
Email will flow from Ex2013 server no problem. Mail from Ex2007 systems cannot deliver to Ex2013 boxes, it dies in queue with a 4.4.7 expired message after issuing a delay message.
I can telnet to ports 25, 587,717,465,475, and 2525 from Ex2007 HT role to new Exchange 2013 server. I can send email from Ex2007 HT role server to new Exchange 2013 server using telnet to port 25.
A ‘get-mailbox’ from the Ex2007 HT role server returns the server and database properly on the test users on Exchange 2013 server.
The only strange thing I am seeing is from the Ex2007 systems, a ‘get-exchange server’ command shows the new Ex2013 server as role ‘16439’ which looks to perhaps be normal.
Why is email not flowing to the new users on Exchange 2013?