What Does "Host Yahoo Cannot Be Found" Mean?
Outlook Express (or Windows Mail) users accessing the Yahoo mail server may sometimes encounter a message that appears like this: "The host 'pop3.mail.yahoo.com' could not be found. Please verify that you have entered the server name correctly. Account: 'pop3.mail.yahoo.com', Server: 'pop3.mail.yahoo.com', Protocol: POP3, Port: 465, Secure(SSL): No, Socket Error: 11001, Error Number: 0x800CCC0DD." The error can occur due to several reasons and signifies a communication breakdown between a Yahoo mail account and Outlook Express.
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Email Protocols
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The simple mail transfer protocol, or SMTP, is a protocol developed to send and receive emails between Web servers. Most Web-server email providers, including Yahoo, use SMTP to send and receive mail messages from one email account to other. While SMTP transports messages between email accounts, POP3 (or post office protocol) retrieves emails from the mail server and deposits them in the custom inbox. For instance, POP3 transfers the messages from the Yahoo email account and deposits them in the Outlook inbox.
Configuration Error
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A user who desires to access Yahoo mails via Outlook Express must establish a connection between his Yahoo mail account and the Outlook application. Yahoo's SMTP and POP3 protocols are added and configured in Outlook to allow for Yahoo mail retrievals via Outlook. Lack of configuration or errors in configuration will likely cause the Outlook application to return the error stating that the Yahoo server cannot be found.
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Firewall Error
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Firewalls are system monitors designed to prevent unauthorized access to and from a private network. Most users have one or more firewalls guarding their computers to prevent unrecognized servers from accessing system hardware and software. A firewall, depending on its settings, may prevent Outlook Express from accessing the Yahoo mail server and may trigger a "cannot be found" error message. "ZoneAlarm" is one such firewall that is known to cause this error.
Anti-Virus Error
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Several brands of anti-virus software offer a service to scan Outlook emails and attachments. In some cases, the email scanning service may block transfer of data between the Outlook application and the Yahoo server. This can cause the error stating that the Yahoo server cannot be found. A user can turn off these scan settings or use a different anti-virus software to avoid the error.
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