why does the content of my emails disappear.

Hello kingclart3,

Thanks for using Apple Support Communities.

If your emails are not being downloaded from your email server, then I recommend that you follow through the steps outlined below.

Follow these steps first:

1. To make sure that you're connected to the Internet, open Safari and go to www.apple.com.
2. Log in to your email provider's website and make sure that the account is active and that you're using the right password.
3. Check your email settings.
4. Restart your iOS device.
5. Remove the affected email account from your device with these steps:
   1. Tap Settings > Mail, Contacts, Calendars.
   2. Tap the email account.
   3. Tap Delete Account.
   4. Add your account again.

Get help with Mail on iPhone, iPad, and iPod touch

Cheers.

Hi kingclart3,

Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action

Take care.