6. Mailscanner :: Sendmail :: 13 smtp Authentication
Plagiarised from:
http://www.madboa.com/geek/sendmail-auth/
and http://www.howtoforge.com/howto_sendmail_smtp_auth_tls Plus various other unremembered sources.
http://mail.ai.net.nz/horde/index.php?url=http%3A%2F%2Fmail.ai.net.nz%2Fhorde%2F