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SMPT Error: mail.XXXXX.com not found

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by moore_a

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This error arrived at my client's site a couple of days ago. Exchange isn't my forte, but we'd very much like to figure out what's causing this. Initially, we thought the ISP was the culprit, but they claim connnectivity was confirmed in spite of the error message. Meantime, my client's email is operating intermittently. Any suggestions on where the problem might be, anyone?

5 replies

by moore_a

Well, it turns out that the ISP changed the DNS address, but didn't tell anybody, so thanks Tim

by timwalsh

This error is saying that the server answereing to the name "mail.XXXXX.com" cannot be found on the Internet. Try pinging mail.XXXXX.com. This will tell you whether you have connectivity to that mail server. If you get a proper ping response, youhave connectivity but there could be other issues (i.e. software problems on the server). If you get back something to the effect of "host not found" or "unknown host", there are name resolution issues (probably withthe ISP if your client isn't hosting any DNS. If you get an IP address, but an error "host unreachable", there are connectivity problems somewhere between your client and the server.

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