Yahoo removed POP3 / SMTP access to their free accounts in 2002.

This sourceforge program provides the equivalent of POP3 and SMTP
email access to free Yahoo accounts by simulating a web browser to
Yahoo and a POP3 server to your POP3 email client

        http://yahoopops.sourceforge.net/

They say

    This application emulates a POP3 server and enables popular email
clients like Outlook, Netscape, Eudora, Mozilla, etc., to download
email from Yahoo! accounts. We do not go against the license
agreements of Yahoo! Mail. This application is completely legitimate
and well within the realms of legal software.
_____________________

Note that although this program is legal and arguably ethical Yahoo 
would probably become 'annoyed' if all their clients used such 
programs. An easier solution is to change to a free email service with 
a better web interface, POP3 access and greater storage capacity :-).



        RM

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