troubleshooting Question

550 5.1.1 User unknown

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geoffdavis asked on
ExchangeWindows Server 2003
14 Comments1 Solution1736 ViewsLast Modified:
Two different people sending email to one user get the following message. One user is sending from a private company email and the others is sending from gmail.

Your message did not reach some or all of the intended recipients.
      Subject:  RE: Home Plans
      Sent:     5/7/2008 8:03 AM
The following recipient(s) could not be reached:
      '' on 5/7/2008 8:03 AM
            550 5.1.1 <>... User unknown
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