Rules in iOS mail
Solution 1:
The best you can do is block the sender from sending messages to you. This is done in Settings/Mail. This will block email, phone calls, etc from the blocked site. This is available on iOS 13 and later.
Ignore Blocked Senders can now be enabled in Settings > Mail. The blocked contacts list is shared with Messages, FaceTime, and Phone. (50775961)
- https://developer.apple.com/documentation/ios-ipados-release-notes/ios-13-release-notes
See image below:
