I checked, and I've removed all references to Outlook Express from my PC - so I can only talk from using Outlook 2003.
You are saying then that you can send email using surpass mail server using port 25. I can't do that because I'm on a residential DSL line, and port 25 and port 26 is blocked. So perhaps you have a business broadband connection that allows you to send mail using port 25. If so, I can't really help you.
Before Port 198 was opened, my only choice to SEND mail was to use BellSouth Mail Servers (port 25) for outgoing mail, and use surpass mail servers for incoming received mail (port 110).
In this setup my mail servers in Outlook are set as follows:
Incoming POP mail server = mail.mydomain.com (port 110)
Outgoing mail server = mail.bellsouth.net (port 25)
My Login information is for my surpass account
tomk
mydomain.com with password
My Outgoing Server is set to require authentication and log using my bellsouth account -
tomk
bellsouth.net with password
This works great as long as bellsouth's mail servers are working (often they are not) and I work from home. When in a hotel, I can't pop mail this way and was forced to use webmail.
This approach should also work for your daughter if she's accessing via SBC territory.
Opening port 198 to send mail bypasses the Bellsouth Mail servers completely, and enable me to pop (or imap) mail from a hotel. The two changes I make to outlook from the above are:
Outgoing Mail Server is changed to = mail.mydomain.com
My outgoing server is still set to require authentication, but this time I use same settings as incoming server, and I set outgoing server smtp to port 198 versus the default 25.
If I change outgoing mail server to mail.mydomain.com, but do not change authentication to be same as settings as incoming server and I leave it set to port 25 - I get the error you are seeing.
If I then change only port to be port 198, then I get a login request from surpass mail server since the login info for bellsouth id/pass is different than it is on mydomain.com. Also the error I get is a username/password one.
I'm thinking that somewhere in Outlook Express there is a place to set your outgoing mail server and authentication that is not being set correctly.
Tom