From click here
When you try to send or receive e-mail messages in Outlook Express, you may receive an error message that your Post Office Protocol 3 (POP3) or Simple Mail Transfer Protocol (SMTP) host could not be found (error code 0x800CCC0D).
This behavior can occur when POP3 or SMTP server account information is incorrect on your computer. If your account information is correct, behavior can be caused by the connection to your Internet service provider because the e-mail servers may be unavailable for reasons such as maintenance.
To resolve this behavior, verify that you are using the correct account settings for your assigned e-mail servers. You can obtain the server information from your ISP or local area network (LAN) administrator. To verify the settings for your Internet E-mail account: