Problem with sending emails with Outlook Express while using broadband connection

When I try to send an email using Microsoft outlook I attached the files and tried to put receivers address.
While doing it the following message comes up suddenly prior to complete and send it.
- Your POP3 server has not responded in 60 seconds. Would you like to wait another 60 seconds for the server to respond?”
The thing is I am not using the dial-up connection but the broadband connection.
My problem is why does this message come?
