How do I delete over 1000 email at one time

It is in the settings to delete after a number of emails have been read . You can change the number of emails and set a time limit for the iPad to keep your mail.

Contact Apple support on this question.

hi John.
How do I delete my junk mail on my iPad? Tap the Edit button at the top and press Delete All. To save you the bother of doing it again go to Settings on the home screen, select Mail Contacts Calendars then your account and touch the Advanced button. Under Deleted Messages select Remove and choose an appropriate timeframe for automatic deletion (i.e.13 Aug 2012

How do I delete my iPad emails? - Telegraph - The Telegraph

www.telegraph.co.uk/technology/advice/.../How-do-I-delete-my-iPad-emails.html Search for: How do I delete my junk mail on my iPad?
To mark a message as junk:

1. On your iPhone, iPad, or iPod touch with iOS 7 or later, open the message, tap the Flag at the bottom, then tap Move to Junk.
2. On your Mac, select the message and click the Junk button in the Mail toolbar. ...
3. At iCloud.com, select the message, then click the Flag button and choose Move to Junk.

Identify and filter junk mail in iCloud - Apple Support

how to remove Junk Email from my IPad Google Search

To delete an email address from your iPad, go to Settings -> Mail and contacts then click on the email address you want to delete. There should be a choice below that says Delete!

Good luck!

You can delete the email account from your ipad or the best and easiest way is to login to you email account directly the the server. Open the webpage of your ISP (gmail.com, yahoo.com etc..) login to your account and delete mails from there. Depending on your ipad email account this is the only way to delete the mails for good.

How to delete or move ALL emails at once in non-jail broken ipad or iphone
It took me weeks of research to figure out finally how to decode this yet another secretive secret of apple. There is a perfect way of deleting ALL emails at once without jailbreaking your iphone or ipad...and here it is:
>> Open Inbox >> Edit >> Mark All >> Mark As Read [Added May 21, 2014 by Adrian; this extra step makes the difference between success & failure for some.]
>> Open Inbox >> Edit >> Check/select the top message; it will highlight the move button.
>> Press and hold the move button and uncheck the message that you had checked earlier.
>> Lift all your fingers off from the ipad screen and leave it alone. Wait until all your messages pile up on the right hand portion of the screen (in ipad); iphone will give you the actual number of emails it has selected for the action. Now they are just waiting for your command to be moved ALL at once.
>> Choose trash to delete all of them or any other folder where u want to move them, like one piece. Remember this will replicate your action on the server so you will ACTUALLY move them or delete them on the server and not just the ipad.
Once you have moved all messages to the trash you can either leave them there for the scheduled cleaning or empty it right away by doing this: go to trash folder and touch Edit. The Delete All button shows up at the bottom of the screen. Hit it! You're done!
If you do not see the effects of your actions on the server make sure you have enabled your email accounts for such actions.
Tips:
1. Please give enough time (could take up to several minutes depending the number of emails to be moved) for the emails to be selected for the move. Your screen will become unresponsive while all emails are being packaged. Once emails are ready, in ipad, you will see them zoomed out on the right hand side of the screen, and in iphone you will see the message showing you the actual number of messages that have been selected.
2. Avoid purging very large number of emails, the mail app might freeze or crash. If your inbox has thousands of emails change your sync settings in mail settings to fill lesser number of emails in your inbox.
3. [Added Jul 20, 2014 by Adrian] Many people have reported needing to repeat the above procedure several times before it succeeds. (I too have found this to be necessary a few times on my iPhone but not on my iPad-go figure.) So my final tip is to repeat the procedure 3-4 times if the mail doesn't disappear the first time. In my experience, if your messages disappear momentarily and then reappear, repeating the procedure will eventually make them stay deleted for good.
4. [Added Sep 18, 2014 by Adrian] If you are using IOS 8, there is a setting that may reduce emails piling up on your device! Go to Settings -> Messages and select Keep Messages under the Message History header. You'll be able to choose to keep your messages for 30 Days, 1 Year, or Forever.

https://www.apple.com/support/ipad

Is it a virus and do you have anti virus protection? or sign in to your account and tick the select all box for these emails, then delete all.

. Your ipad does not store those emails on your ipad so if you are having a storage problem, that won't fix it. To delete all the emails though, you have to go to the email account itself and delete them from there.

Easy click on first one once until its high lighted ,hold shift key in and use the page down key until all is highlighted then pres shift delete and it is gone for ever. Its going to ask if you are sure you want to delete all of these emails you click yes.