[champrins]

Open Outlook Express
Goto the TOOLS menu above
Choose ACCOUNTS
Goto the MAIL TAB at the top (there are several)
Click once on the email account concerned
Click on the PROPERTIES button to the right

Now you can check your settings

The GENERAL TAB at the top
Make sure Receive mail box is ticked

The SERVERS TAB at the top
Make sure your username and password are correct
From here make sure REMEMBER PASSWORD IS TICKED
And check this one

Make sure LOGON USING SECURE PASSWORD AUTHENTICATION is NOT ticked

Below that you will find outgoing settings
Make sure these are set at your ISP settings

Should work fine for you now