RE: Unknown Address Error 550 - 5.2.1 Message Rejected

  • From: "Steve Moffat" <steve@xxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 7 Apr 2005 20:31:15 -0300

Wrong email address??...:)) 

-----Original Message-----
From: joed@xxxxxxxxxxxxx [mailto:joed@xxxxxxxxxxxxx] 
Sent: Thursday, April 07, 2005 7:57 PM
To: [ExchangeList]
Subject: [exchangelist] Unknown Address Error 550 - 5.2.1 Message

We have an Exchange 2000 Server within our company.  Our users have
Outlook 2000 on thier PCs.  Someone tried to sending me an email with a
file attachment.  I was not able to receive the email with the
 The sender instead received a message in their email:

Subject: "Delivery Status Notification (Failure)" with the following

The following message to <email address> was undeliverable.  The reason
for this problem:
5.1.0 - Unknown address error 550 - '5.2.1 Message rejected.'

Any ideas of what would cause this or where to start troubleshooting?



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The haggis is unusual in that it is neither consistently nocturnal nor diurnal, 
but instead is active at dawn and dusk (crepuscular), with occasional forays 
forth during the day and night. 

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