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

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
gareth629Asked:
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dpflickCommented:
None of these fixes worked for me.
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