My enviroment is EXCH 2003 (EXCH2003_1 – cluster based) and Exch 2010 (EXCH2010).
I have migrated all users to the Exch 2010 except service accounts.
Also public folders are migrated and deleted from Exch 2003.
I had to add a second Exch 2003 (EXCH2003_2) to my enviroment to get rid of the Exchange cluster.
Unfortunately this caused some mailflow issue – when the mail is sent from internal system using SMTP to the EXCH2003_1 cluster, the EXCH2003_1 push the mail to EXCH2003_2 and the mail is stuck in the Local delivery queue on EXCH2003_2.
Seeing this I have created a SMTP connector between EXCH2003_2 and my CAS servers but this did not helped.
What could be the reason of that and how can force it not to use EXCH2003_2 for mail delivery.