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Why is a backup MX server rejecting email
Question asked by Brian Davidson - February 27, 2015 at 10:15 AM
Unanswered
We had a fairly catastrophic issue this morning with our primary server (provider related).  I have a backup mx server setup that was working properly, queuing incoming messages. Suddenly it has started rejecting incoming email saying "No such user here".
 
The primary server is being brought online, but SmarterMail is not yet working there and in fact I have disabled the service. So I don't quite understand why the backup is now rejecting email. I can confirm that the rejected messages were routed to the backup server.
 
I have since taken the backup mx offline to stop further rejects, but I'm curious what would cause this to happen. Any thoughts? 

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Steve Reid Replied
March 3, 2015 at 6:52 AM
I recently went through an issue with support where I was experiencing this exact issue. It was fixed in the most recent version. Was a small issue maybe that's why it's not on the changelog.

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