I found this on google
https://discussions.apple.com/thread...rt=30&tstart=0
They suggest to down load iBackupBot. Read through the thread and see if the suggestions there will help you.
One post in particular:
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I use the program iBackupBot for iTunes.
http://www.icopybot.com/itunes-backup-manager.htm
I would recommend doing a backup of your phone directly before running the program, as the program pulls your latest backup.
Once open, you will select Plugin from the top menu and then select Recent Email Address. This will pull email addresses you have sent to. You can delete them individual. Once done, close out the pop up.
You will then select the icon for Restore Backup/File to iPhone/iPod touch. This will do a restore, only making the changes you selecting. Your iPhone will automatically restart. If you test one of the emails you deleted, you will see they no longer show up.
iOS 4
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I hope this helps.