I have two email accounts on my iPhone: Cox and Gmail. Each accounts have few messages in their respective Inbox. No attachments. The Draft, Sent, and Trash folders are empty. Yet, with time, the size of this app continues to grow and take up more of the free space on my iPhone 5: and its size is limited, the 16 GB model, of which 12.5 GB is available to the user. I am running iOS 8.4.1.

It's as if there is garbage collection that isn't taking place and the storage space doesn't get freed-up. Think about how hard drive space may get freed-up after sectors are freed-up when you defrag a Windows hard-drive. Battery Doctor helps free up cache space, etc., but does not affect the Mail app. My Mail app now takes up 3.0 GB of space!

I have tried removing the accounts, and then setting them up fresh, but this doesn't help… the space is still taken. I have performed factory resets on the iPhone where it is wiped clean and then have all apps reinstalled, but the problem still exists. And, so far, I do not have a program that saves my Notes off to my laptop and maintains the formatting of the text, e.g. Bold, Italic, carriage returns, etc. So, trying to recover the iPhone to the way it was is a real hassle, and the Mail app doesn't reduce in size… it will continue to grow. Any ideas?

  • You have been at iOS 8.4.1 for some time. How long ago (days, weeks) did the memory begin to be hogged? You seem to have a lot of Notes. Do you store a lot of data in your notes? Have you recently started taking more or longer Notes? Does this correspond with the increase in memory hogging?
    – Parradoxx
    Commented Feb 11, 2016 at 22:29
  • My iPhone 5 has been hogging space since I first learned how to use it more than two years ago. It came with iOS 6.1.4. I have many Notes with reference information addresses, etc to help me when I have to use cabs, which is often. I also use Notes to save info that I gather when performing research with computer equipment specs. Many Notes are formatted: Bold, Italic. spaces, etc to make them easier to read
    – DaleB
    Commented Feb 13, 2016 at 2:50
  • Notes stored in your GMail account have a special folder within your GMail mail account, and thus will take up space in your mail app.
    – owlswipe
    Commented Jun 1, 2016 at 11:16

1 Answer 1


Delete App Mail, just delete. Reinstall the Mail app. Add your email accounts and the hidden hidden storage will disappear

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