> make sure you read /usr/local/share/doc/exim/POST-INSTALL-NOTES.
which needs an examle of how to hack /etc/mail/mailer.conf
# $FreeBSD: src/etc/mail/mailer.conf,v 1.3 2002/04/05 04:25:12 gshapiro Exp $
#
# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
#
sendmail /usr/local/sbin/exim
send-mail /usr/local/sbin/exim
mailq /usr/local/sbin/exim
newaliases /usr/local/sbin/exim
hoststat /usr/local/sbin/exim
purgestat /usr/local/sbin/exim
randy