YPOPs! is an application which emulates a POP3/SMTP mail server and provides free POP3 and SMTP access to Yahoo! Mail. It does not depend on Yahoo's POP3/SMTP mail server. You can use a mail client of your choice!
The Configure Dialog Box - Receiving Emails
Several features can be tweaked according to your liking
YPOPs! supports secure communication with the Yahoo! Servers
You can download emails from any folder in your Yahoo Mail
The About Box - From the YPOPs! v0.7 release
The Configure Dialog Box