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		Email Information & Issues Outside user cannot send to you Most likely, the senders ISP does not have reverse DNS enabled. The following websites have information about this process: http://pubpages.unh.edu/notes/require_rdns.html http://www.unh.edu/signals/april2007/reversedns.html Also, if you are working with a user who appears to be affected by this Reverse DNS Lookup process, you can advise them to send an email to Sand.Paul@gmail.com with a message about the problem they are having.  The Mail Administrator can look at the header of the message to confirm if this is a Reverse DNS problem or something else.