incomming mail server: pop.mail.yahoo
outgoing mail server: smtp.mail.yahoo.com
username: yourusername@yahoo.com
...outgoing server requires authentication
incommig server port:995
...requires SSL
outgoing server port: 465
..uses SSL type of encrypted connection

...been working for me for years.

>Really? How?
>
>>On Yahoo you can do it without paying....
>>
>>>It looks like you have to have premium (paid) account in order to use external email client with Yahoo or MSN.