While trying to clear up space on my iPhone, I deleted all email accounts, as Mail was using well over 700Mb. I was expecting this to also clean up the excessive space being used by Mail, but it hasn't touched it - Mail is still using over 700Mb. I've powered off and back on again several times, and tried re-adding and removing the account multiple times, but Mail still uses loads of space.

Anyone have any ideas how to clean this up?

  • Very weird. Even with my email account linked, Mail and its data only takes up a meager 3.3 MB. Sep 26, 2015 at 21:55
  • Is it IMAP or POP? Did you empty the Trash?
    – Tetsujin
    Sep 27, 2015 at 12:24
  • It was a google account. I can't get into the trash because I've deleted the account. Adding the account back shows an empty list until it can download the emails from the server. Sep 27, 2015 at 16:03

1 Answer 1


It seems like I have answered a number of questions with this particular solution, but let's go for it again.

Often times a backup, wipe, restore process will clear out the cruft still sitting around in the rather opaque IOS filesystem. I don't know why but it works:

  1. Backup: Connect the iPhone to your computer and do a manual backup to that computer. Password protect the backup so you don't have to re-enter passwords.
  2. Wipe: Once you have a good backup go into the iPhone > Settings > General > reset > Erase all content and settings. And let it do its thing.
  3. Restore: Once the phone reboots and is waiting on it's welcome screen plug it back into your computer and restore it from the backup you just made.

9 times out of 10 all the inexplicable space usage on the phone goes away and you have got your space back.


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