Unfortunately email service isn’t quite foolproof yet. Outages and glitches still happen, and when they do you’ve got to find the problem fast. The folks over at the EmailTalk blog have a great post about how to troubleshoot your Exchange mail server. Here’s an excerpt:

This article will describe how an IT Administrator can easily troubleshoot a common problem: when emails don’t come in from the Web. We’ll show you how you can quickly test if the issue is related to your mail server, firewall, or DNS, allowing you to pinpoint the problem and get it fixed right away.

Check it out – it provides some valuable tips and tricks!