Exchange Server 2008 cannot receive emails from outside
I have Exchange Server 2008 that has been working fine for 2 years. All of a sudden, we are unable to receive emails from outside. Internally we can receive and send email. We can also send email to the outside world.
I have spoken to MIS Group, DNS Group and Tech Support at AT&T. Name services, MX Record and DNS are all good. I can ping the Exchange Server and also remote into the server. All services for Exchange are running; I can also telnet the server on port 25 with an answer 220-Ready to accept mail; but I cannot telnet from outside the network.
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