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I've encountered the following message and cannot send messages

Question asked by bobloblaw on Oct 1, 2013
Latest reply on Dec 20, 2013 by kevinds

An unknown error has occurred. Subject 'Re: Hilarious!', Account: '', Server: '', Protocol: SMTP, Server Response: '554 Connection rejected due to poor reputation.', Port: 25, Secure(SSL): No, Server Error: 554, Error Number: 0x800CCC6F.

We are not a server. Help!