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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] >