I finally get the yahoo IMAP working (kind of). It is not truely push email notificaiton because it cannot get the instant notification. However, the notifiation comes in every 15 minute interval. I thinks this is done by the polling timer.

The problem on the Yahoo IMAP is the instant notification only works on the att/cingular subscriber. I tested this with same phone, same email account but different SIM cards. The PUSH works on the att/cingular SIM card, but not on the other provider's SIM card.

To get around this problem, I disable the PUSH option in the IMAP menu (only in 1.1.1). Then, the email notificaiton will be done by the polling timer which can be set to 15 minutes/30 minutes.

It works finally, at least thru' the timer polling.