multiple "no sender," email in inbox

I have 50 email in my inbox on my iPad 2 from "no sender" with "no subject" with sent dates ranging from 12/31/69 to 12/31/00. They only show on the screen in the "All Mailboxes" window. They do not show in any of the 3 email accounts when show individually. I am unable to edit and delete these emails. They do not show on my iMac mail inbox.

Any suggestions?

Thanks

docare