Using JavaMail, I am able to read and download mails from Gmail, but it is not working for yahoomail.com. I've tried it in all the possible ways I know, but nothing is working. While searching, I learned that Yahoo Mail does not provide POP3 for free users, so I tried IMAP, but it is also not working.
there is a workaround for this, please see http://www.khimhoe.net/2011/06/11/how-to-enable-pop3-in-the-new-yahoo-mail-updated-11june2011/
for No7. Use menu link Forwarding instead of POP Access