Unable to send mail using OE

[coolguy]

I get the following error when I try to send email using Outlook Express 6. I am suing WinXp Pro + SP1 :

The connection to the server has failed. Account: 'MyRealBox', Server: 'smtp.myrealbox.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Socket Error: 10051, Error Number: 0x800CCC0E

What does it mean and how should I rectify it?

[Ancient]

It means your ISP is probably blocking port 25. You need to set your SMTP setting for outgoing mail to that of your ISP instead of using the local setting you've got currently.

[coolguy]

Ya, I did just that and now my mail is going fine. I am using my ISP's smtp server to send mail instead of MyRealBoxs'