> but I would I like to use the TLS for incoming connection (like from
> clients which do need do authenticate). How can I disable outgoing
> TLS but enable incoming TLS?
This setting in /etc/courier/courierd will do it (or wherever your
config directory is):
##NAME: ESMTP_USE_STARTTLS:0
#
# The following variables specify whether or not the ESMTP *client* will use
# SSL when talking to a remote ESMTP server that supports SSL.
ESMTP_USE_STARTTLS=0
However, if you connect to a server that doesn't support STARTTLS, it
should just continue on - the above setting doesn't _require_ TLS, it
_tries_ it. The problem arises when talking to various bad servers
(Exchange / IMS - see
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q237327) which
advertise TLS and can't deliver; for those servers you will want the above
set to 0. There's also a way to disable it on a server-by-server basis,
which was recently added to Courier, and whose syntax I forget...
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