Hi,
I was given by Apple support a solution to this problem. Just delete the email account from your iPad and then re-add it. When you delete the email account it also deletes all the emails in the account's inbox! But, first make sure you have saved all the emails on your desktop computer if you want to keep them. Here's the steps:
- First upload all the emails from your iPad to your desktop computer.
- Make sure you delete the emails on your ISP online server or your iPad will just upload them again!
- Then, delete the email account on your iPad by going to the settings and selecting the account, then delete. Make sure you have a record of all the settings so that you can easily re-add it.
- Then, add the email account back on your iPad.
This should delete all those emails! It worked for me.
D