IMail never quit unless "Force Closed" during shutdown

Hi!

I am currently using Mac OS X 10.8.3

My IMail never quit unless I Force Close It.

I have Two google accounts, one icloud account and a yahoo account linked with it.

I have tried to change the "Check for new mail" to mannual, but it didn't worked out for me.

I have also seen other threads related to this, but none of them really helped me out.

Thank you in advanced!