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I'm just setting up an Exchange Server 2003 in house and I've setup NAT on the firewall to forward port 25. &nbsp;It has been about 5 days since I had our MX updated, but it seems like we're only getting 50% of our mail.<br />
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Do I need to have ICMP turned on? &nbsp;I've noticed that many mail servers out on the net reply to ping tests. &nbsp;Is it possible that some e-mail servers are queueing our mail because they fail a ping test to our server and think its not available?
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I'm just setting up an Exchange Server 2003 in house and I've setup NAT on the firewall to forward port 25.  It has been about 5 days since I had our MX updated, but it seems like we're only getting 50% of our mail.

Do I need to have ICMP turned on?  I've noticed that many mail servers out on the net reply to ping tests.  Is it possible that some e-mail servers are queueing our mail because they fail a ping test to our server and think its not available?

Exchange 2003 / ICMP

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.