Maybe it's because Outlook Express has decided to automatically disconnect you from the Internet after checking for e-mail...
Why it should do this is anybody's guess. I know of two people who recently had this issue; they could receive e-mail, but were unable to send any. If they clicked send-and-recieve, they got an error about being unable to establish a connection with the POP (receiving) server. Why? Because their Internet connection had been terminated by Outlook Express!
By an action other than of their own hand, the connection settings for Outlook Express had been mysteriously altered. Whether coincidence of not, both computers experiencing this issue were running Norton Antivirus. Could this application (or some other application) be responsible for changing their Outlook Express settings?
The solution, however, is to reconfigure the connection options in Outlook Express:
- Choose "Options" for the "Tools" menu;
- Click on the "Connections" tab;
- Uncheck "Hang up after sending and receiving".










I never use Outlook Express. For me, it's not really important. I just directly catch my emails from the email webpage.