Depends how it's designed. I've been doing something similar for almost a decade. If I get an email from a non-whitelisted person, they get an auto reply asking them to go through a simple hoop. Once they do that, the email lands in my inbox.

Yes, many people go through that hoop!

I can still see their emails if they don't. They site in a Quarantine folder. I used to look at it frequently to catch the occasional straggler, but I rarely do that now. I've set up an LLM to go through all my quarantined emails in the last N days, and send me an email on which of the quarantined emails probably should be viewed.

I'm OK missing out on a (very rare) good email if it means I don't have to deal with crap mass mails. And let me tell you: Life is great when you don't deal with mass mails.