I get the "Unable to Move Message. The message could not be moved to the mailbox Trash". whenever i try deleting from my ipad 2. I am unable to delete from Trash...HELP

Not sure if it will be there for all types of account, but I still get it on iOS 10 for my account : Settings > Mail > Accounts > account > Account > Advanced > Deleted Mailbox

Another option is to delete and add the account back

You haven't gone in far enough (though it might depend that the email account). Are you on a screen something like :

If you are then do you not have the 'Deleted Mailbox' line (halfway down my above image, not at the bottom of it) ?

I finally figured it out.

This has worked for me.

Go to settings, scroll down to Accounts & Passwords, tap outlook, tap mail days to sync, change to no limit.

That’s it! This worked for me. So far all emails delete without coming back. I’ll post an update should something change.

I don't have a Microsoft Exchange account, so not sure how they work - if somebody else has had a similar problem they'll hopefully reply with how they fixed it.

The '-' instructions is how you used to close apps back in 2012 when I posted it, on iOS 10 it's different : Force an app to close on your iPhone, iPad, or iPod touch - Apple Support

All previous answers did not work for me.

I have gsuite / google apps paid account since that provides push mail.

So none of the imap answers are very useful.

What did help was

https://support.google.com/a/users/answer/138740?hl=en

and specifically going to

http://m.google.com/sync/settings

in your iOS device' browser.

That brings up a (unknown) mobile sync settings menu that is, well, very well hidden.

Tick the second checkbox Enable "Delete Email As Trash" for this device to on.

Click save.

Do this per device where this email account is used.

To clear the local mail cache, go to settings / mail / your gsuite account.

delete the account.

When done, reboot the iOS device.

After reboot, go to settings / mail / add account.

Add the gsuite / google apps account by selecting EXCHANGE (see help page above).

Add m.google.com as the server.

User is your full email address.

check your email / calendar / contacts / notes preferred settings.

And all should be fine again.

Weird. Mine only says Move discarded messages into: and gives me the option of Deleted Message or Archived Message.

I have deleted and set up the account at least four times. Still runn into the same issue.

Stuart

I reviewed all my email accounts. Only on my iCloud and gmail accounts do I have a box that looks like yours, ie that shows both Mailbox Behavior and Move Discarded Messages Into. My two Microsoft Exchange accounts do not have the Mailbox Behavior box. It is one of the Microsoft Exchange accounts that is giving me the problem.

One other thing I forgot to mention. I was never able to do the following step that you mentioned in your earlier post:

If that doesn't work then try closing the Mail app via the taskbar : from the home screen (i.e. not with the Mail app 'open' on-screen) double-click the home button to bring up the taskbar, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of the Mail app to close it, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar.

I never got the '-' and only succeeded in deleting my mailbox app which I then had to reinstall

One other thing I forgot to mention. I was never able to do the following step that you mentioned in your earlier post:

If that doesn't work then try closing the Mail app via the taskbar : from the home screen (i.e. not with the Mail app 'open' on-screen) double-click the home button to bring up the taskbar, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of the Mail app to close it, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar.

I never got the '-' and only succeeded in deleting my mailbox app which I then had to reinstall

Yes, indeed. Turning mail off and on again for the account in question worked for me as well. It was my Outlook account which had the issue and the advanced settings described in the other suggestions were not available.

I have this same issue with my Iphone 6+ ever since the 10. upgrade. None of the fixes work! I deleted the email app and have been using another, but the app forced me to reinstall it.

Why is apple forcing us to use an App that does not work?

What worked for me was to tap the filter icon in the bottom left of the inbox folder which converted to "unread". In the dialog box which then appears, uncheck "unread". When you go back into the inbox and hit the filter button again, the obstinate email disappears. I don't know where it went since it was not in the deleted folder, but it was completely gone from the email program.

Please give that a try.

I deleted the account from mail, contacts and calendars, then turned off the iPad2 for a short time. Turned the iPad back on and reinstalled the account in mail, contacts and calendars and the mail I had been trying to remove was gone.

Try turning the account off and on : Settings > Mail, Contacts, Calendars , then tap the account on the right, slide Mail to 'off', exit settings and go back into the Mail app, and then go back to Settings and slide Mail back to 'on'

If that doesn't work then try closing the Mail app via the taskbar : from the home screen (i.e. not with the Mail app 'open' on-screen) double-click the home button to bring up the taskbar, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of the Mail app to close it, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar.

Another option is a reset : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.

If you still can't delete them then go into Settings > Mail, Contacts, Calendars, select the account on the right-hand side of that screen, select Account, then Advanced, Deleted Mailbox, and under On The Server tap the 'Trash' folder so that it gets a tick against it - then come out of that series of popups by tapping on the relevant buttons at the top of them and then see if you can delete emails.

Turning the account off and then on solved the problem for me. Thanks!