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550 5.1.1 The e-mail account does not exist

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I cut over my DNS and MX records over 24 hours ago. Not that this matters but it may be relevent. Senders to my domain that is now hosted by O365 are getting bounce backs, 550 5.1.1 RESOLVER.ADR.RecipNotFound.

I AM a valid user, i DO get some inbound email. Why would soem get rejected?

===========================

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

      Subject: TEST
      Sent: 5/16/2011 1:20 PM

The following recipient(s) could not be reached:

      dan@csofmaine.com on 5/16/2011 1:20 PM
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail

address, or contact the recipient directly to find out the correct address.
            <csofmaine.onmicrosoft.com #5.1.1 smtp;550 5.1.1 RESOLVER.ADR.RecipNotFound; not found>

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