I too am having the same problem. I am using Outlook 2000 and have
two email addresses connected to it. One is my work email address
which I have no problems sending and receiving mail. The other is a
paid subscription to Yahoo mail. Since I can't have two .pst files
because Yahoo uses POP3, I created a rule that forwards my yahoo mail
to a separate inbox folder. Anything I send from my yahoo account
just sits in my outbox. When I click on Send/Receive, it shows an
error message 'unable to connect to server'.