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amlydiate

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#550 4.4.7 QUEUE.Expired; message expired Exchange 2007 SBS

Hi,  

We're running a 2008 SBS server providing email and file services to 10 users.  This server has been running fine for 6 months but one of the users has started getting bouncebacks when sending mail to a client with an aol.com email address (the address is valid). The bounceback says:

#550 4.4.7 QUEUE.Expired; message expired ##

I've run the Exchange Tools and it seems there are a few of these bouncebacks to different domains over the last few months but this is the first time I've been told about them.  I'm a bit of a novice to Exchange 2007 and DNS but I've heard that I may not have reverse dns setup.  I've tried looking into how to do it but the Microsoft explanation is a bit over my simple brain.

Anyone have any comments on what the problem is most likely to be as mail in general on this server seems fine in and out.

Many thanks

Adam
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amlydiate

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Thanks have pursued both options and it's now fine.