IPhone 5 says using 4GB of storage on mail but all emails are deleted?

Hi, recently my iPhone 5 has been asking me to create more storage and I noticed that 4GB of the space being used was on mail. I have 2 accounts a GMail and a POP3 - All of them are regularly deleted so there shouldn't be any real impact on storage - Can anybody help as to why the device is still saying I'm using that much on mail?
Thanks

I'm running into the same issue (on both my iphone's).
The one that is hit worst has 5,2 Gb wordt of storage for mail and no accounts in there (anymore).
How can we recouperate this space without doing a reset?
Apple, please advice.

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