KB ID 0000803

Problem

While testing mail flow on a new SBS 2011 Server, outbound mail worked fine, but no mail would flow in. When I attempted to Telnet in from a remote host this was what I saw;

421 4.3.2 Service not available
Connection to host lost.

Solution

Normally I’d expect to see an error like this if the Exchange ‘Receive Connector’ was misconfigured, (if you’re not using SBS 2011 create a new default receive connector and make sure there are no firewalls in the way).

If you are using SBS 2011 you need to run the ‘Connect to the Internet’ Wizard (seriously!)

After this check inbound mail flow again.

Related Articles, References, Credits, or External Links

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