My problem is similar, many many old deleted emails have reappeared - have tried all the fixes mentioned but nothing has worked.
After each of the iOS7 updates the phone has restored as many old deleted emails as it can (space permitting) from my POP3 email account (not gmail, yahoo or hotmail).
The key issues for me are:
* Privacy - Where are the emails coming from? - the phone is restoring deleted private emails from up to 1 year ago. They are no longer on my mail server and have not been for many months (have always been set to delete after download) - so how is the phone restoring them? I do not use cloud services and never have - I am concerned as to where these emails are being restored from and that I can't delete them permanently.
* Space - The phone is downloading as many emails as it can until the phone is full! The emails include attachments. Each time I delete them more are downloaded.
* Productivity - Deleting the emails manually is a complete waste of time, and took well over an hour the last time this happened - I can't see a way of selecting all emails for deletion and then deselecting the few recent I would like to keep before sending the majority to the trash.
I have been tolerant of update problems in the past but this probably the last straw unless there's a fix.
