How to get rid of the mails once and for all???

In my iphone 5s with ios 9.2 i have deleted all mails and the phone doesnt even show any mail anymore but there still seems to be some issue because t

In my iphone 5s with ios 9.2 i have deleted all mails and the phone doesn't even show any mail anymore but there still seems to be some issue because the mail app still covers 1.2 gb of my iphone storage... Please help me solve this problem!!!

or:In my iphone 5s with ios 9.2 i have deleted all mails and the phone doesn't even show any mail anymore but there still seems to be some issue because the mail app still covers 1.2 gb of my iphone storage... Please help me solve this problem!!!

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