This is an old revision of the document!
Inside /etc/mail/smtpd.conf:
table aliases file:/etc/mail/aliases table secrets file:/etc/mail/secrets listen on lo0 action "local_mail" mbox alias <aliases> action "outbound" relay host smtps://support@mail.ircnow.org \ auth <secrets> match for local action "local_mail" match for any action "outbound"
Inside /etc/mail/secrets:
support support:PASSWORD