Apple’s mail app
always downloads and store the emails so you can access them easily and so
Spotlight can use them. But in some cases it’s not a good thing especially if
you have a lot of mails which it can use a large amount of space.
So first of all
let’s take a look on how much space this application is taking.
To do so open
Settings > Storage & iCloud Usage > Manage Storage and then you just
have to scroll down to the mail application. This will show you how much the
mail and attachments are using.
So to reduce this
you can manually remove the mails especially those with attachments.
If you just want
to find mails with attachments, you can tap Mailboxes > Edit > Enable
Attachments
NOTE : Don’t
forget to make sure that the trash is empty after cleaning your inbox.
But probably this
is not the easiest way to do it, this method will delete your mail from the
server once for all, also it will take a long time.
A Better Methode: Remove the
Account and Re-Add it
For a better solution and an easier one. You can force
your device’s Mail app to start over and discard all those offline copies of
emails by removing your current email accounts and re-adding them.
To do this, go to Settings > Mail, Contacts,
Calendars > Tap the name of your email account > Delete Account.
Next, power down your device and start it back again to ensure all
offline caches are completely cleared.
Open the Mail app and you’ll be asked to provide your email account
details again.
Your iPhone will start downloading your mails again, but it will
clear out the old backlog of cached emails and file attachments.
NOTE : This is a better solution but not the best one, is just a
temporary one. After a while the Mail app will take more and more space like it
used to be.
For a permanent solution you can install another Mail application and
use it instead of the one of apple.
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