How to stop spam on ipad

For iCloud email account: Identify and filter junk mail in iCloud - Apple Support

Apple tutorial: https://www.youtube.com/watch?v=QbSdVkyr1Y0

For other specific email accounts try going into your email web account to see about setting up/ turning on filters to block them as junk from that end. They end up in spam/junk and don’t download to your Mail App. I did this to rid myself of multiple emails. Good luck.