http://www.cybersharks.net/forum/forum.asp?FORUM_ID=2

Norton Internet Security, or any Antivirus software or Firewall Software needs to be disabled.

Solution

The first step is to check your Outlook Express settings, making sure that the POP3 and SMTP server is mail.cybersharks.net, and that your full user name and password are correct.

Then test your connection by following this procedure.

• Click the Start button then RUN type in cmd on (Windows NT/2000/XP) or Command (Windows 95/98/ME). This will open a new command prompt window, with white text on a black screen.
• Type in the following exactly as it appears. You will not see what you are entering so take it slowly, and if you make a mistake, start again.
  telnet mail.cybersharks.net 110 and then click the Enter key on your keyboard. You will then be connected to the email server. Servername is either email.sharkemail.net or email.wickedlyfast.net depending on which email server you are on.
• Type in USER followed by your email address e.g. USER jo_blog@yourdomainname and then click the Enter key. You will then get a message +OK Please enter your pass, with the PASS command
• Type in PASS followed by your password e.g. PASS joblog0370 and click the Enter key. If it is correct, you will get an OK Well done message.
• Type Quit
• Type in the following: telnet mail.cybersharks.net 25 and click enter. If you see the email servername in a banner message across the top then you have successfully connected to the SMTP server. Type quit.
• If you can do this, you can connect to the server and so the problem lies somewhere with Outlook Express.

Try Restarting the computer!  IT WORKS FOR SOME REASON

If you can't get in this way either, your password may have gotten corrupted. Please reset the password using the web-based interface for your mail server and try again.

If this does not resolve your problem are you running anti virus software or firewalls? If so disable them and try again. If the problem has vanished, configuration of these products could be the problem, particularly if they are set to automatically scan incoming and outgoing email.
NOTE: Windows XP has a firewall built into the operating system which you can disable by selecting there too and try again.

The basic checks have now been completed. If you are still getting this error message, there are two more drastic options to try. The first is to reinstall TCP/IP from scratch in case this component of Windows has somehow become corrupted. To do this click on the Start menu and then enter your Control Panel. Next double click the Internet Options icon and select the Connections tab. From here you should be able to identify your dial-up connection which you need to select and then click on Settings followed by Properties and select the Advanced tab. Here the checkbox for the Internet Connection Firewall should be unchecked to test whether it is causing this problem.

If this does not resolve the problem in windows XP try resetting the TCP/IP stack, by:

• Clicking on Start then Run then type in cmd
• On the screen which opens, type in netsh int ip reset c:\resetlog.txt

If you're still having problems, it could be that Outlook Express is itself corrupt. Microsoft's Instructions on how to delete it and reinstall it, along with making a backup of your address books etc, are located here for Windows 95, 98, and ME and here for Windows 2000

Troubelshooting Outlook & Outlook Express Error 0x800ccc0f

You can try deleting the account from Outlook Express and recreating it after a reboot to see if that clears the issue.
I have seen OE accounts or OE itself get corrupted an need to be reinstalled.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;199990

http://support.microsoft.com/?kbid=813514

http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q263837&

http://service1.symantec.com/SUPPORT/nav.nsf/docid/2001060516275506

http://service1.symantec.com/SUPPORT/nip.nsf/735050b77b1fcece88256bc
7005c3bc6/9cb4d85846dbbd4588256d17007d38aa?OpenDocument