README: For smtp-auth to work, you need to install a sasl plugin. (libsasl2-plug-plain and libsasl2-plug-login for the default setup) To find more information on STARTTLS and AUTH, see: http://www.sendmail.org/~ca/email/starttls.html http://www.sendmail.org/~ca/email/auth.html https://www.TBS-internet.com/ssl/sendmail-tls.html