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Outlook 2K Error

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Megz

IS-IT--Management
Oct 13, 2003
9
Some people are getting the following message when sending emails:

Your message did not reach some or all of the intendend recipients.
Subject: <<subject>>
Send: <<date sent>>
The following recipient(s) could not be reached:
<<address of receiver>> on <<date and time>>
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. (<<Server name>> #5.5.0 smtp;551 relay from your IP is not authorised)

Please help as I cannot find anything on 551 ndr!!
Thanks
 
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