I deleted every single mail from Mail.app on iOS 8.3 (inbox, sent, trash). However, Mail still occupies 798 MB for "mails and attachments" according to the memory overview. How can I clear this memory?

  • 1
    Reboot the phone.
    – Tetsujin
    Jun 8, 2015 at 11:09
  • @Tetsujin I did ...
    – lejonet
    Jun 8, 2015 at 16:00
  • Sync; backup; restore would be 2nd suggestion
    – Tetsujin
    Jun 8, 2015 at 19:25

3 Answers 3


According to OS X Daily, you can try removing the account from the mail app and adding it again. Source

  • 1
    Yes this worked, but it's an awful thing to have to do each time. For the record, I did this 3 months ago, and had to do it again today to clear 2.4GB of space. On a 16GB phone, that space is quickly missed. I assumed that a daily sync to clean out pix would be enough, but the mail app goes in this ridiculous cycle.... Dec 16, 2015 at 18:17

Tetsujin is correct, backup the phone, then go into settings -> general -> reset and erase all settings and data. Then restore the phone from the backup you just created. The available space should be better.

One thing I learned a couple of years ago and not sure if it still applies. If you do a hard reset (Sleep and home buttons pressed until the phone reboots) three times in a row, IOS will do some rather intensive cleanup and file system checks after the 3rd reboot. That might help. Not sure but it is quicker than backup/restore and won't hurt a thing.

  • hard power off is harsh on the phone, just make sure the phone fully boots and is not loading any apps or writing any data when you do a hard reset (sleep plus home button - hold down together 5 seconds)
    – hamish
    Jun 1, 2017 at 1:43

Go to iTunes and try to buy or rent a movie with more memory needs than your device has available OR just go to TV app and try to download a movie you already own that is larger than the space you have available. You will be informed you do not have enough memory, and this will clear memory caches, especially email ones, freeing up more memory. This method increased my memory available from 780MB to 2GB

  • What a devious way to spend money. I wonder if trying to play a movie you already purchased will work.
    – bmike
    Aug 14, 2016 at 21:42
  • I think it checks your storage before asking you to pay, so you shouldn’t have to actually buy/rent it.
    – user11633
    Sep 6, 2016 at 15:30

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