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not receiving external mail from exchnage 2010

Jamesm007 asked
Last Modified: 2012-08-13
I have recently migrated from exchange 2003 to 2010. Both exchange servers have been working fine, internal and external mail.

We have our roter managed by external services. I have had to have the mail IP changed from the old mail server to the new one.

At the same time I also decomissioned the 2003 server in the correct way according to ms documentation.

After this I can not receive external mail to the 2010 server.

I can send out mail, I can send and receive internally mail OK but no external mail is getting in.

I have run some tests

canyouseeme.org shows port 25 is open and it appears it is pointing to the correct IP.
I have run the exchange 2010 SMTP check mail and this shows all green ticks.

Any suggestions how I can troubleshoot this further?
with thanks
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