@kissedxx, I've had some luck with some setups. Follow the instructions here for either POP or IMAP setup
http://www.knowyourmobil...l_on_the_nokia_n96.html
And remember
Yahoo Mail standard POP3 settings
Incoming Mail Server (POP3) - pop.mail.yahoo.com (port 110)
Outgoing Mail Server (SMTP) - smtp.mail.yahoo.com (port 25)
OR for Outgoing you can use Safaricom - mail.gprs.safaricom.com