BAD & GOOD NEWS UPDATE [see below]
Yes, there is a way to delete all your unwanted iPhone/iPad emails from the Mail app in one operation! No more left-swipe:tap Trash for every individual message. No more Edit: tap the single open circle next to every individual message and finally tapping Trash. And you don’t need to jail break your device.
If you leave your iDevice on for a few days and come back to find a few hundred messages on it that you’ve already downloaded elsewhere this trick will save you time and irritation. I didn’t discover the method—it’s far from obvious—but found it on one of many Apple discussion threads bemoaning this irritating hole in Mail functionality.
BAD NEWS UPDATE [added September 25, 2016] IOS 10 has removed the “Trash All” button. Who knows why? The procedure listed below (the original 2014 post) still works for many people.
GOOD NEWS UPDATE [added October 3, 2015]! IOS 9.0.2 finally displays a “Trash All” button after Edit is pressed, thus obviating the procedures described below. If your phone won’t handle 9.0.2, the following procedure is often successful; read the comments for a detailed description of hundreds of people’s successes and failures.
It works! I present to you this great tip from shashbasharat found on MacRumors (slightly edited for clarity).
How to delete or move ALL emails at once in non-jail broken ipad or iphone
>> Open Inbox >> Edit >> Mark All >> Mark As Read [Added May 21, 2014 by Adrian; this extra step makes the difference between success & failure for some.]
>> Open Inbox >> Edit >> Check/select the top message; it will highlight the move button.
>> Press and hold the move button and uncheck the message that you had checked earlier.
>> Lift all your fingers off from the ipad screen and leave it alone. Wait until all your messages pile up on the right hand portion of the screen (in ipad); iphone will give you the actual number of emails it has selected for the action. Now they are just waiting for your command to be moved ALL at once.
>> Choose trash to delete all of them or any other folder where u want to move them, like one piece. Remember this will replicate your action on the server so you will ACTUALLY move them or delete them on the server and not just the ipad.
Once you have moved all messages to the trash you can either leave them there for the scheduled cleaning or empty it right away by doing this: go to trash folder and touch Edit. The Delete All button shows up at the bottom of the screen. Hit it! You’re done!
If you do not see the effects of your actions on the server make sure you have enabled your email accounts for such actions.
Tips:
1. Please give enough time (could take up to several minutes depending the number of emails to be moved) for the emails to be selected for the move. Your screen will become unresponsive while all emails are being packaged. Once emails are ready, in ipad, you will see them zoomed out on the right hand side of the screen, and in iphone you will see the message showing you the actual number of messages that have been selected.
2. Avoid purging very large number of emails, the mail app might freeze or crash. If your inbox has thousands of emails change your sync settings in mail settings to fill lesser number of emails in your inbox.
3. [Added Jul 20, 2014 by Adrian] Many people have reported needing to repeat the above procedure several times before it succeeds. (I too have found this to be necessary a few times on my iPhone but not on my iPad—go figure.) So my final tip is to repeat the procedure 3-4 times if the mail doesn’t disappear the first time. In my experience, if your messages disappear momentarily and then reappear, repeating the procedure will eventually make them stay deleted for good.
Tags: delete, delete all, emails, ios7, iPad, iPhone, mail, messages, one step, tip, trick

