Q9101: How can I install Exim on Mac OS X?
A9101: (1) There is useful advice on this web page: http://www.afp548.com/Articles/Jaguar/exim410.html.
(2) There is a package installer available at this URL: ftp://members.aol.com/AFP548dotcom/EximInstaller.sit.
(3) There is another package installer for the combination of MySQL, Exim, Exiscan, CourierIMAP, and SpamAssassin at this URL: http://maxo.captainnet.net/installs/mail-install.html.