Can't update applications on iPhone?

Everytime I try to update any application on my iPhone, something will pop-up asking for the password of an email I don't even recognize. And not just one but 3 different emails. Some application will asks for the password of a particular mail and so on. Why is this happening? Is there any way I can get rid off those other emails except from my Apple ID?

Go to settings>Store>Apple ID and Change it to the correct Apple ID. Then you can update apps.