iPhone Error: Cannot Delete Emails When Using IMAP

By default, iOS attempts to delete IMAP email by putting it in the phones trash. This causes an error to come up saying that the messages could not be moved to the trash folder.

To fix this:

  1. Go to Settings > Mail, Contacts and Calendars > {your email account} >Advanced.
  2. Select Deleted Mailbox.
  3. In the On Server section, select the Trash box under the server. This will allow you to remove email from an iPhone or iPod.
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