To use "@@PKGNAME@@" as the system's mail transport agent you have
to install "@@PREFIX@@/etc/mailer.conf.sendmail" as global mailwrapper
configuration file. The command below will do that for you:

ln -fs @@PREFIX@@/etc/mailer.conf.sendmail /etc/mailer.conf

If you are upgrading from "sendmail" 8.8.x don't forget to rebuild all
databases with "@@PREFIX@@/bin/newaliases" and "@@PREFIX@@/sbin/makemap".