Step 1: Grab your mobile device
Step 2: Tap Settings.
Step 3: Tap Mail Contacts and Calendars.
Step 4: Tap the account that you are wishing to sync.
Step 5: Select the email address once again to enter into the preferences for that account.
Step 6: Tap the Advanced button at the bottom of the screen.
Step 7: This is where we will now have the option to sync up our Deleted, Sent or Drafts folders. The process is the same for all three of the folders.
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Tap Drafts Mailbox to setup the syncing for draft messages.
Tap Sent Mailbox to setup the syncing for sent messages.
Tap Deleted Mailbox to setup the syncing for deleted messages.
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Step 8: In the next menu simply select the matching folder name from under the On The Server section.