How do we do this w/o knowing the address?

How do we do this w/o knowing the address? Like, just prevent a category of mails from coming in.

Hello There!

You can create a filter with you know the subject of the email or at least the domain name (@domain.com).

But n this case the article is referring to the email noreply@jotform.com.

Please feel free to reach out if you have other questions or need some more help. I will be happy to help!