Why can't I delete all emails on my iPhone?
Best Answer: It means that the phone is continuously syncing with the server (provided an internet connection) and deleting it from your inbox will not be enough to make sure it no longer shows up in your email.
How do I delete all my emails at once on the app?
Try going into Settings > Accounts & Password > account > Account > 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 see if you can now delete emails.Mar 4, 2018
How do I delete thousands of emails at once?
Sadly, there isn't a snappy way to cut them immediately. Instead of clicking a nifty button, you'll have to press and hold the Shift key. Click the first email, keep holding down Shift, click the last email and then hit Delete.Aug 16, 2021