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Thanks for the assistance. &nbsp;I was hoping it was not a problem with my server and I think you agree. &nbsp;We are checking into the accuracy of the e-mail address the user is sending to but are pretty certain it is correct. 
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Thanks for the assistance.  I was hoping it was not a problem with my server and I think you agree.  We are checking into the accuracy of the e-mail address the user is sending to but are pretty certain it is correct.

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I have Exchange 2003 and Outlook 2003 as the mail client -- one of my users sent out an e-mail and it was returned as undeliverable with the following message:<br />
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There was a SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator.&lt;mail.mydoma<wbr />in.com #5.5.0 smtp;550 &nbsp;recipient rejected<br />
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I'm not sure why this was returned - any help would be appreciated. &nbsp;Thank you.
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I have Exchange 2003 and Outlook 2003 as the mail client -- one of my users sent out an e-mail and it was returned as undeliverable with the following message:

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.<mail.mydomain.com #5.5.0 smtp;550  recipient rejected

I'm not sure why this was returned - any help would be appreciated.  Thank you.

Mail Returned as Undeliverable -- #5.5.0 smtp;550  recipient rejected

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.