Cant send mail on Windows mail via yahoo

My brother bought a new Dell laptop that came with Vista pre-installed. We configured Windows Mail and added yahoo account as POP3 after facing many errors. After doing everything when I try sending or receiving any mail through this account, it gives me an error message saying:

“Subject 'test', Account: 'Windows Mail', Server: 'smtp.mail.yahoo.co.uk', Protocol: SMTP, Server Response: '250 8BITMIME', Port: 25, Secure(SSL): Yes, Server Error: 250, Error Number: 0x800CCC7D”

I don’t have any idea what could be the problem.

Is it Yahoo Plus account or just normal yahoo account? I’m asking this because normal Yahoo account wont provide POP3 account. You will need to pay extra and buy Yahoo Plus account if you need POP3 access.

I have been through this problem while setting up Yahoo. After lots of research finally I managed to fix it with the following settings. See if it works for you as well:

My Incoming Mail server is a POP3 server
Incoming mail (POP3) - pop.mail.yahoo.co.uk
Outgoing mail (SMTP) - smtp.mail.yahoo.co.uk

Along with this also make sure that your outgoing mail server must require authentication. Save the settings, restart Windows Mail. It should work.