I followed step by step the instructions on the guide for mailing setup 
(chapter 13), but when i try to send the test message to myself i got 
this failure:
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 rsk... Connecting to localhost.localdomain. via relay...
 rsk... Deferred: Connection refused by localhost.localdomain.
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rsk is the name of my local account, of course.
Anyboby got a clue?
Thanks.