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451 4.7.0 Temporary server error. Please try again later. PRX5

Posted on 2014-01-17
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Last Modified: 2014-04-01
hi all,

background

Exchange server 2013 on Server 2012 mailbox and client access server (only Exchange server in environment)
Version 15.0 (Build 516.32)
Standard.

From our inbound spam filter supplier a few emails are not getting through with the following error.

451 4.7.0 Temporary server error. Please try again later. PRX5

Any ideas on how to fix this?
thanks
Gareth
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Question by:gareth629
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by:dpflick
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None of these fixes worked for me.
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