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SBS 2003 to SBS 2008 Migration SMTP Inbound Not Working

I am trying to finish a sbs 2003 to sbs 2008 migration and have run into an issue. I cannot get external inbound mail to work. Outbound mail is working and as long as I have the 2003 box up and running inbound mail works. But when I disconnect the 2003 box from the network inbound mail stops. I can telnet to both boxes from inside the network on port 25. The 2003 box responds with the external domain name (domain.com) and the 2008 box responds with its local FQDN (server.domain.local). The 2003 box will respond to telnet on the outside network. The firewall is set to NAT the external address to either internal server. I don't know how to make 2008 except the inbound mail.

Thanks in advance
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Carter_Machinery
Asked:
Carter_Machinery
1 Solution
 
Rob WilliamsCommented:
2008 defaults to remote.MyDomain.com. Have you either changed this or set up a new DNS host record with the service provider that manages your external DNS?
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Please have a look at our migration guide and follow through to where a step may have been missed:

http://blog.mpecsinc.ca/2009/06/sbs-2003-to-sbs-2008-migration-guide.html

Philip
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Alan HardistyCommented:
Your firewall needs to forward TCP port 25 traffic to the SBS 2008 box and you need to remove the internal connector between the SBS 2003 box and the SBS 2008 box.
This should allow the SBS 2008 box to receive mail.
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Carter_MachineryProgrammerAuthor Commented:
Thank you very much for the advice. I had port 25 forwarded to both boxes which was apparently causing issues. Removed the 2003 box, made sure 2008 was defined as mail.domain.com and it is working now.
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