trouble shooting non delivery report:Relaying denied on Exchange server 2003

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Exchange 2003
Outlook
Tech support
I administer an Exchange server 2003 on Windows 2000 server. My users use POP3/SMTP on the Outlook2003. One of my user received a non delivery report from the exchange like the following: -- Quote-- recipient@abc.com on Wed, 20 Apr 2005 13:51:07 +0800 You do not have permission to send to this recipient. For assistance, contact your system administrator. <exch00.def.com #5.7.1 smtp;550 5.7.1 <recipient@abc.com>...Relaying denied> --End of quote-- My user could send email to this recipient successfully in the past. Can anyone guide my to find a solution? Thanks.
ASKED: April 21, 2005  9:41 PM
UPDATED: April 27, 2005  4:25 PM

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I havent seen both of those errors together.
With you dont have permissions to send to user, that sometimes is the user(recipient) has passed his mailbox limit.

Relaying denied smtp550 is not uncommon. Is it only for one user or to one domain ? If it was for all mail to the abc.com domain they might be using a real time black list that has your servers nated ip listed, try using www.dnsstuff.com to check. Another possibility is abc.com is using reverse dns to lookup your mx record and thats not working. I’m assuming the mail is coming from an exchange client and your smtp connector is setup ok.
To be honest you can get a much better explanation by doing a google on “550″ and “relaying denied”.

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