Can't receive external mail on exchange 2003 working before.

[mosdef73]

My exchange servers are up and online. My users can send mail internally and externally. They can only receive internal mail. We have made no MX changes. Any one have any ideas. I have restarted everything to in clude the DC, Sans, and both Exchange servers?

 

[smah]

What is between the exchange server and the internet - any firewall? From outside the network can you telnet to port 25 on the MX address?

 

[mosdef73]

I do have a PIX Firewall in between that we have had no changes made on or outages. I can telnet to the mail server on port 25 no problem but still not getting external mail. )-:

 

[Zelandakh]

Can you telnet on port 25 from outside the firewall?