On Mon, 2006-10-30 at 18:44 -0700, Ashley M. Kirchner wrote:
How do I configure sendmail to listen (and use) another port, IN
ADDITION to port 25? Our outgoing mail server uses port 25 for internal
stuff, and for our remote users using authentication, I'd like them to
use port 2525 (specially since a few of them have port < 1024 blocked by
their ISP.) So I need to have sendmail be able to use both port 25 as
well as 2525 (or whatever other port number, 2525 just seemed logical.)
----
No ISP's block ALL ports below 1024. They block commonly used/exploited
ports and prevent you from running your own servers...25, 80, 137, 138,
139, 445
check out this from /etc/mail/sendmail.mc
dnl # The following causes sendmail to additionally listen to port 587
for
dnl # mail from MUAs that authenticate. Roaming users who can't reach
their
dnl # preferred sendmail daemon due to port 25 being blocked or
redirected find
dnl # this useful.
dnl #
dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl
dnl #
dnl # The following causes sendmail to additionally listen to port 465,
but
dnl # starting immediately in TLS mode upon connecting. Port 25 or 587
followed
dnl # by STARTTLS is preferred, but roaming clients using Outlook
Express can't
dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use
STARTTLS
dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses
smtps
dnl # when SSL is enabled-- STARTTLS support is available in version
1.1.1.
dnl #
dnl # For this to work your OpenSSL certificates must be configured.
dnl #
dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl
dnl #
This is where you need to go.
Craig