[newbie] Postfix problem

[Adahma]

I've been a long time RH user, and was surprised upon installing Air
and discovering the default use of Postfix over sendmail.  I've heard
good things about Postfix, so I'm not exactly apposed to this, but
currently none of my mail retrieved with fetchmail is being delivered. 
Can someone tell me what I need to kick start to get my mail flowing?

TIA,
jdk
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