Email bounce back 550 5.1.1 recipient rejected

Posted by Stan on Server Fault See other posts from Server Fault or by Stan
Published on 2012-12-12T22:45:37Z Indexed on 2012/12/12 23:05 UTC
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exchange

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outlook

A client recently switched to Exchange Server / Outlook for their email. Since then emails from my company to any email address at their company bounce back from the System Administrator with this error:

  Your message did not reach some or all of the intended recipients.

   Subject:  Email Solution
   Sent: 12/12/2012 11:08 AM

   The following recipient(s) cannot be reached:

   '[email protected]' on 12/12/2012 11:08 AM
    550 5.1.1 <[email protected]> recipient rejected

Looking in the Message Options of the bounce back email shows no data in the Internet Header field.

My client's IT guy says we're not being blocked, but I cant think of any other reason the bounce would occur.

Any suggestions on what questions to ask or how to fix this would be helpful.

I'm using a desktop version of Outlook 2007 and connecting through my ISP.

Thanks.

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