I have reproduced the behavior
that Mickey identified on my Treo 700w. Working with Jim Lawson, we’ve
been able to perform some traffic analysis and have determined that Outlook
mobile uses SSL (STARTTLS, actually) in its initial connection, but no on
subsequent connections.
This explains why it continues
to work with the other SMTP providers that Mickey tested, which also allow plaintext
password authentication without encryption, but fails with UVM’s server,
which requires an encrypted channel to receive a plaintext password.
I’ve posted a description
of the problem to an active Windows Mobile forum, where a MS MVP has referred
the problem to another expert. This morning, I’m working on formally
opening a support issue with Microsoft.
I’ll post an update as
soon as there’s anything interesting to report.
--Geoff