MS exchange 2003 Meeting requests

By jmomberg ·
Im currently having issues with MS Exchange.
When someone tries to send a meeting request an error exists. Please advise me as what to do to fix this.

From: Mail Delivery system []
"undelivered mail returned to sender"

This is the mail system at host
i'm sorry to have to inform you that your message could not be delivered to one or more recipients. it's attached below. for further assistance, please send mail to postmaster.
if you do so, please include this problem report. you can delete your own text from the attached returned message.
the mail system

<emailaddress>: host[ip address] said:
550 unknown user (in reply to RCPT TO command)"

and the details file looks like this

"Reporting-MTA: dns;
x-postfix-queue-id: 788A646466
x-postfix-sender: rfc822; email address
arrival-date: Thu, 4 Jun 2009 08:48:09 +0200 (SAST)

Final-recipient: rfc822; email address
original-recipient: rfc822; email address
Action: Failed
Status: 5.0.0
Remote MTA: dns;
Diagnostic-code: smtp; 550 unknown user

This only effecs meeting requests.
Email seems to work fine

Thank You

Johan Momberg
South Africa

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