Although it seems to happen more frequently with a new system build, it can happen at any time. Your Exchange server, whether part of an SBS install or not, suddenly stops delivering e-mail. Inbound mail is coming through fine, but users report that their mail is not getting delivered to people outside the organization, and if you look in Exchange System Manager, you see outbound mail stacking up in one or more queues.
Here are some basic, simple steps to help determine where the problem might lie.
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