Unable to send / route mail from exchange 2010 to 2003 mailboxes

I'm looking for experts on the topic of routing groups between legacy Exchange 2003 and a coexisting Exchange 2010.

(Still) works: I am able to both send and receive mail external domains on the internet from both servers. Also I have no trouble sending from 2003 to 2010.

Problem: I am unable to send any mail from mailboxes on 2010 to 2003.
These emails stick in the message queue.

Detail: the external email domain is different from the internal domain name.

I would really like some help with this issue. Anyone?

Thanx in advance!
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Joost KuinSenior system / network administratorAsked:
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S_K_SConnect With a Mentor Commented:
You mentioned on your initial note as below:
"Problem: I am unable to send any mail from mailboxes on 2010 to 2003."

Last note from you states "you have migrated all mailboxes to 2010 and no means on 2003 to test things"

I'd like to understand if there is no mailbox on 2003 then why are we concerned about 2010 not being able to send to 2003. Also you mentioned emails are stuck in Queue: Are they PF related messages that are stuck or any user related ones.

- SKS
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S_K_SCommented:
Are you able to telnet from Exchange 2010 server to Exchange 2003 server
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Do you have any Smarthost on the RGC or SMTP virtual server on 2003 ?

Secondly can you Telnet from Exchange 2003 to 2010 server and drop an email ?

Hope a 2 way bi-directional RGC is created ?

- Rancy
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Simon Butler (Sembee)ConsultantCommented:
If this is the RGC that was created when Exchange was installed, it is not uncommon to find it hasn't created correctly.
Therefore after the initial checks of a smart host on the SMTP Server service and restrictions on the SMTP Server and Receive Connector which stop the two platforms from communicating, removing and recreating the connectors is the first thing to do.
AV software can also stop the servers from talking, because they block "local" SMTP Traffic. McAfee is notorious for doing this, so should be checked as well.

Simon.
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S_K_SCommented:
Going step by step would make sense. Telnet should be the first thing on the check list. Then comes the RGC and SMTP Settings. If all set then as always you may look at the AV settings and ensure exchange files are excuded from being scanned by the AV
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
why not try to run EXBPA from the toolbox in EMC and check for any errors .....
Hope DNS is working fine ?
Try Inbound and Outbound through
www.exrca.com

- Rancy
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Joost KuinSenior system / network administratorAuthor Commented:
Thanx guys for your amazingly fast support! Unfortunately I have to wait until tomorrow 20:00 CET before I can do some testing. I'll be sure to let you know how that works out.

Have a great weekend!
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Did you get a chance to check and share your feedback so ... can assist you :)

- Rancy
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Joost KuinSenior system / network administratorAuthor Commented:
To be honest, it's kinda silly but after migrating all mailboxes this weekend I no longer have the means to test traffic from 2010 to 2003.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is everything working fine with E2k10 ?
Email routing is happening directly using E2k10 ?

I would say to stop all Exchange services on the E2k3 and then run EXBPA from E2k10 mailbox and check no alerts from E2k3 or any other issues faced which should be taken care of :)

- Rancy
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