I like Postfix. I used sendmail and qmail in the past and just never "got it". Postfix seemed logical to me and once I setup my first postfix mail server, haven't had any reason to try anything else (past 4 years). I've heard good things about Exim, certain web hosting systems (ie cpanel) I *believe* use Exim by default (which is I think a good endorsement for Exim given the thousands of cpanel servers out there with hundreds of thousands of domains). I just never had any reason to try Exim as Postfix seems to be very similar in capability to Exim.
I deal mainly with small business networks. I tend to use assp, postfix, dovecot, clamav for the mail server. Usually this is a set it and forget it configuration.
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