Make sure to set NEWMAILCF to false and SENDMAIL to true in
/etc/athena/rc.conf.

To allow someone to receive mail on charon:

1) Make sure they're in /etc/passwd.
2) Add them to passwd.localusers.
3) Run /etc/make-aliases as root on charon.
4) Kill and restart the daemon sendmail process.

To modify an existing alias in /etc/aliases:

1) Edit the aliases file.
2) Run /etc/make-aliases as root on charon.

To add a new alias to or delete an existing alias from /etc/aliases:

1) Edit the aliases file.
2) Run /etc/make-aliases as root on charon.
3) Kill and restart the daemon sendmail process.