AUTH confirmation with SENDMAIL

[Ken Hornstein]

>250-AUTH DIGEST-MD5 CRAM-MD5
>250-STARTTLS

A lot of the time applications either have a default configuration or are
hardwired to only offer "insecure" SASL mechanisms when session encryption
(like TLS) is being used.  Why don't you try:

  openssl s_client -connect smtp-server:smtp-port -crlf -starttls smtp

Do a EHLO, and see what is being offered as SASL mechanisms then.

--Ken