If I understand your question correctly you are concerned about others accessing your email on your phone. I use AppLock to secure apps on my unlocked devices.
To logout of your email you:
Go to settings - scroll down to accounts - tap on the type of email account (e.g. Email or Microsoft Exchange ActiveSync) then press the account you wish to remove - finally tap remove account at the bottom and confirm
I hope this has answered your question if not feel free to post again using the same link as before or register an account so you are able to reply directly.
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