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#554 5.1.0 Sender denied ##

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Hi, 

Strange question, 

We have a users who intermittently cannot email another internal user. He gets the error 

#554 5.1.0 Sender denied ##

I have ran Get-SenderFilterConfig and the person did not show in the list. I have checked the incidents on Forefront protection and non showed up. 

Any other ideas what it could be ? 


MCP,MCSA,MCSE,MCTS,MCITP Enterprise Administrator,Citrix Certified Administrator


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