How to remove iphone mail account?

My friend has my email and password on his iphone, and I want it gone. He won't remove it, and it's his iphone, so how do I remove it? Does changing the password on its own work? Is it enough? Or do I have to do something else?

Changing your password will work. Next time it tries to get new mail on that phone, it will verify password, which will not work.So, change it on your own computer real quick.

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