Exchange 2003-2010 SMTP Connectors

I have my Ex2010 servers/s coexisting with a single Ex2003 but no external Mail Flow.
I have migrated a test mailbox from Ex2003 to 2010, and can send/receive email between a 2003 mailbox and the migrated test mailbox on 2010.

However, before I change the routing rule on my Email Gateway to point to the new Ex2010 do I have to change the SMTP Connector/s on Ex2003 that currently point to the Email Gateway to point to the Exchange HUB/CAS?

In advance thank you for your support
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CTCRMInfrastructure EngineerAsked:
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Miguel Angel Perez MuñozCommented:
During setup, a connector between Ex2003 and 2010 was created: https://technet.microsoft.com/en-us/library/aa997292(v=exchg.141).aspx

Then, changing mail inbound to Exchange 2010 causes mailflow goes from 2010 to 2003 (instead of 2003 to 2010 since is now), since this connector is bidirectional, not required more, only ensure your external mailflow is correct (using your Ex2010, Ex2003 or both).
CTCRMInfrastructure EngineerAuthor Commented:
Hi Miguel
I have on Ex2003:
The RGC (Routing Group Connector) created during 2010 setup providing flow between 2003-2010
1 x SMTP Connector that points to the Mail Gateway

Do I need to make any changes to the above, or do I just point the Routing Rule on the Gateway to point to Ex2010 instead of Ex2003 leaving the Exchange Connectors as they are?
Miguel Angel Perez MuñozCommented:
You can keep as is, but must to check:

- Your Mail gateway accept mails from Ex2010 and Ex2003 (or can use Ex2010 as smart host on Ex2003 smtp connector to external mail.
- Your Ex2010 can accept external mail from your Mail Gateway: https://technet.microsoft.com/en-us/library/bb738138(v=exchg.141).aspx

On this scenario, your mailflow is:
- External mail flows from mail gateway to Ex2010. Exchange routing decides where mail goes to.
- If user is on Ex2010 database, goes to database, if user is on Ex2003 system, uses routing connector and delivers to Ex2003 database.
- Outbound mail by default flows from Ex2010 to Internet (unless you have changed external connectors on Ex2003/2010)

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CTCRMInfrastructure EngineerAuthor Commented:
Thanks for your support
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