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(FAQ) Why do my users get a "No transport provider" error in Outlook?

My Outlook users get the error 'No Transport Provider is available for delivery to this recipient.' What does that mean and how can I fix it? 

The 'No transport provider' is a generic error issued by Microsoft Outlook for a variety of reasons. Please view the following article from the Microsoft Knowledge Base for more information:

http://support.microsoft.com/default.aspx?scid=kb;en-us;197417