Apple iPhone iOS 8.4 - Manual (Page 62)

Chapter 6 Mail 62
Mail settings
Go to Settings > Mail, Contacts, Calendars, where you can:
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Create a different mail signature for each account
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Add mail accounts
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Set Out of Office replies for Exchange mail accounts
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Bcc yourself on every message you send
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Turn on Organize by Thread to group related messages together
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Turn off confirmation for deleting a message
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Turn off Push delivery of new messages, to save on battery power
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Temporarily turn off an account