You may encounter this error when attempting to send mail using a POP3 mail client such as Outlook Express or  Windows Mail.  To fix this issue you need to enable SMTP authentication.

• Go to the Tools menu.
• Click Accounts...
• (Outlook Express)                       In the "Internet Accounts" window, click the Mail tab.
• Select your mail account by clicking it to highlight it in blue.
• Click the Properties button.
• Click the Servers tab.
• Make sure your "Account Name" is your entire email address.
• At the bottom of the window, put a check next to "My server requires authentication."
• Click OK.
• Try to send mail again.

 "691 - Access denied / Invalid username or password"

This error is usually due to a mistyped username or password.  You should make sure your username contains the entire string (e.g. user@netdot.com), and retype the password before continuing.

"678 - Remote computer did not respond"

This error can occur for a number of reasons, but is usually due to the dial-up phone number you are using not working for your area.  Try a different number.

"633 - Modem port already in use"

Restart your computer.  Sometimes Windows fails to free up the modem after it disconnects.

 Click here to view all DUNS errors.