I have recent experience that corroborates what Ed surmises. On a new
computer running Windows XP Pro, I installed Office 2003 and attempted
to send mail via Outlook. It failed consistently when sending via
mail.msu.edu. I had it configured to use port 465 directly. I did an
Office Update, and Outlook sends via mail.msu.edu just fine now.
/rich
On Wed, 18 Aug 2004 11:32:06 -0400, Ed Symanzik <[log in to unmask]> wrote:
> mail.msu.edu listens on both ports. Port 465 is SSL encrypted only. Port 25
> uses TLS to switch to encryption. I have found no consistent behavior from
> clients explaining when they need one or the other. Your own configuration, for
> example, uses port 25 then, with no apparent reason, needs port 465. (this is
> with Eudora?)
>
> A wild guess for you is that for 4 weeks you were sending mail to users @msu.edu
> which does not require authentication and encryption. At week 4 you sent to a
> non-msu.edu address and relay was denied.
>
> Another wild guess is that there is some auto-patch from MS that causes things
> to work differently.
>
> --
> Ed Symanzik
> MSU Mail Team
> [log in to unmask]
>
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