SMTP AUTH on 587 while still listening on port 25?

I'm running sendmail 8.13.1 on a CentOS Linux box (equivalent to RedHat
Enterprise Linux 4.5) which is exposed to the Internet via DNS and MX,
etc.

With this configuration, I'm able to receive e-mail from the outside
world, and all is working well.

What I'm now trying to do is to enable my roaming uses (running laptop
computers outside my firewall) to send e-mail via my sendmail server
using SMTP AUTH.

I've been reading the Bat book (Sendmail, 3rd Edition) as well as several
web pages, including the tips at www.sendmail.org, cf/README, etc., but
can't seem to get it working.

First of all, I have TLS connections working. Am I correct in assuming
that if my roaming users connect using TLS, that the user name and password
they send will be encrypted - as well as the e-mail message itself?

If this is the case, do I need to use saslauthd, or can I just configure
AUTH to use "PLAIN" as the auth mechanism?

Next, when I try to configure the sendmail server to listen to port 587
for AUTH connections, the server no longer listens on port 25. This is
what I added to my sendmail.mc file:

DAEMON_OPTIONS(`Port=587, Name=MSA, M=Ea')dnl

Is it possible to have sendmail listen on port 25 for general connections
from the Internet for delivery of mail to my local users, as well as listen
on port 587 for authenticated connections from my roaming users trying to
send e-mail locally and to the Internet?

Thanks for any help.

.

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