We use both Postfix and Exim here, and in the process of working withboth of them I've formed some opinions. My view on the two is this:

Postfix is easier to do simple things with. Exim is much easier todo complex things with.

A Postfix null-client configuration (one that sends all mail to asmart machine somewhere, putting a default domain on any address thatdoesn't already have one) is maybe ten lines of configuration. If youcan do that in ten lines

Suppose that you are in the situation from yesterday's entry , where your support volume is too high to let youuse a single support alias that everyone is on but particular supportrequests are passed from person to person. As it happens, I think thatthere are still ways to avoid having a public ticketing system as yourprimary support method.

The problem that a public ticketing system is really solving here isthat you need a separate point of contact for each ticket that goesto several people (but not everyone)