"Enter Network Password" message on Outlook

Hi,

I'm running Outlook on Windows XP. For some reason today it's asking me to enter my network password. When I do this, the same message pops up again.

I seem to be receiving emails fine but I can't send.

Outlook Send/Receive Progress shows an error message saying that my email server (mail.btopenworld.com) rejected my log-in and that I should verify my name and password in account settings, which I've done and they're both fine.

Any ideas why this is happening or what I can do?

 

Usually if your passwords are verified correctly. Then usually its a server problem. Try contacting your isp to verify that they aren't having server trouble.