Go to Message Board | Go to Home Page Symptoms 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). Cause 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. Resolution 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: Start Outlook.On the Tools menu, click Accounts. NOTE: If Accounts does not appear on your Tools menu, then you are not using Outlook Express 5.On the Mail tab, click the name of your e-mail account, and then click Properties.On the General tab, verify that your e-mail address is correct.On the Servers tab, verify that the e-mail server information is correct for both the incoming mail (POP3) and outgoing mail (SMTP) servers. Verify that both servers have the correct settings for your password and account name. Ask your ISP if your server requires you to log on by using a secure password authentication and if your outgoing mail server requires authentication.On the Connection tab, verify that the connection that you use is correct. For example, you may connect through a LAN or through a dial-up connection. Without a valid connection, your e-mail program cannot communicate with the e-mail servers.On the Advanced tab, verify that your server ports are correct. POP3 servers use port 110 and SMTP servers use port 25. Verify that these ports are correct. For more information, contact your ISP. Click OK, and then click Close to save any changes.