how to change the default mta?

[Rino Mardo]

i have debian2.2r0 and using exim.  how can i change the default mta
to postfix?  i will be installing postfix from sources and doing "dpkg
-r exim" won't allow me to remove exim.

-- 
"In is out and out is in.  But out is out and in is in."
        -- Pumbaa

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