It is free [0].
GPL-incompatibility is a practical issue when reusing code in other
programs. It's not a problem for running the program. The FSF uses and
recommends GPL-incompatible programs like TeX ("[w]e will use TeX as our
text formatter" [1]).I use Postfix, it might be easier to configure for what I need. I don't have much experience with Exim. [0] http://www.gnu.org/licenses/license-list.html#IBMPL [1] http://www.gnu.org/gnu/manifesto.html
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