how do I get sendmail SMTP-AUTH to use pam (and not SASL2)?

["Jeff Wiegley, Ph.D." <jeffw@cyte.com>]

It seems that it is quite a nightmare to get SMTP-AUTH working
with sendmail in debian.

After two days I've discovered that sendmail is using something
called sasl (sasl2 actually) to do the authentication and it
requires something called "realms".

Well, I don't want this. I want sendmail to use the same
information present in /etc/passwd and /etc/shadow to do the
authentication so that I don't have to keep issuing
saslpasswd commands to add users every time I add a user.
It just seems silly to try and keep two different authentication
databases synchronized.

sendmail configuration in debian is *very* confusing.

Could somebody please tell me how I simply configure SMTP-AUTH to
authenticate using the information present in /etc/passwd and
/etc/shadow (pam, I guess?) AND I would like it to be a
persistent change so that if I upgrade the sendmail package or
rerun update-conf/sendmailconf it doesn't break.

Thanks,

- Jeff