To Whom It May Concern:
Im not sure if this is the righ foum but it is the closest I could find related to my question.
Im currently in the process of trasitioning from 2003 to 2013 exchange via 2010 and Im stuck with mail flow issues when migrating mail mail boxes from the 2003 server to the 2010 server.
Setup.
I have a Primary DNS server in a DMZ with the name (mynetwork.com) with inbound address of 10.1.1.1 The DNS server and the Firewall is configured to pass email traffic to the 2003 Exchange server on the internal network (mynetwork.local) x.x.x.213:25 (the Exchagne 2010 is configured with the ip x.x.x.15). As far as I can tell all the IP settings are correct in the forward and reverse look up zones.
I have installed Exchange 2010 and tested and confirmed that the connector between 2003 and 2010 is working. My clients are Oultook 2007 so there is no need to replicate free busy information or public folders.
I changed the the settings to point to the new Exchagne 2010 server (x.x.x.15) and I have migrated two test email moxes to from 2003 to 2010 to test email. However, I cant seem to get mail to flow properly from either the mail clients on the 2010 server or the clients with mail boxes on 2003 server. From the test accounts on the 2010 server the clients can send and receive email externally and internally to each other but not to the clients on the 2003 server. Also email flow stops completely for the 2003 clients, they cannot send ro receive email internally, externally or to the 2010 clients. (by clients I mean the location where the 'active' email box resides)
I have checked about all the setting I could think of, every thing looks correct I just can seem to get mail to flow propely for email clients on 2003 and 2010 when the i point mail flow to the 2010 server (x.x.x.15)
Any suggestions would be greatly apprecated.
Thank you for reading my post.