When moving or deleting an email on your iPhone you get the error:
Unable to Move Message: The message could not be moved to the mailbox.
This only happens if you are using IMAP servers for your email and isn’t an issue for POP mailboxes.
How-to fix this error
1. Press the Home button and choose Settings.
2. Scroll down and click Mail, Contacts, Calendars.
3. Tap your email account.
4. Scroll to the bottom and click Advanced.
5. Scroll to the bottom and tap the empty IMAP Path Prefix.
6. Enter INBOX in capitals
Note: some visitors report that they had to click ‘Done’ at the bottom of the screen although this doesn’t appear on my iPhone. Clicking the “account” button at the top left of the screen followed by “Done” on the top right of the next screen was enough to save the setting for me.
7. Press the Home button and then re-open Mail.
8. You will now be able to delete or move your emails on your iPhone.
