here is detailed instructions to see your Yahoo mail through pop:
In order to read your Yahoo! Mail an external email client (such as Eudora, Outlook, Netscape, etc.), you will need to configure the Incoming (POP) and Outgoing (SMTP) server settings so that it can send and receive messages from your Yahoo! Mail account. Generally, you can find these settings under the Tools or Preferences menus for your particular email program.
Important: Do not delete your incoming mail settings
If you are already receiving mail from another mail server (such as incoming mail to your address at your ISP), you will need to add a new POP account. Sometimes this is called a new "profile," sometimes a new "personality," depending on your email client. If your email client only allows you to receive mail from one POP server at a time, make sure you write down your current settings before you replace them with Yahoo! Mail settings so that you can change them back if you need to. Below you will find the server settings for accessing your Yahoo! Mail.
Server Settings
Incoming Mail Server (POP3): pop.mail.yahoo.com
Use SSL, port: 995
Outgoing Mail Server (SMTP): smtp.mail.yahoo.com
Use SSL, port: 465, use authentication
Account Name/Username: lordpatamon
Email address: lordpatamon@yahoo.com.mx
Password: Your Yahoo! Mail password
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In order to use the pop mode you have to enable in the options of your yahoo mail account
on Yahoo Mail is for free users too