How to make a white list + analogue of Captcha in the mail server?

Question

postfix

There is a public service where, according to "business logic", it is necessary to disclose email addresses to a wide audience of people (the entire Internet).
After that, I would like to make sure that those companies that left their email do not fill up with spam, so the idea was born to implement something in the form of a simple Email captcha that would work as follows:
- On the site we publish a fake email generated randomly on our domain
- In a separate table matching a fake email with a real one
- we set up a mail server on our domain, which, when receiving an email to a fake email, would first pass it through spamassign and if it seems to it that the email is clean, it will quarantine the original email for XXX hours, sending the sender a response in the style "your email has been quarantined. For your email to be whitelisted - please answer the question - STSI stands for.". Accordingly, if the letter was sent by a person and not a robot, he will be able to answer the question and trigger further processing of the quarantine letter (sending it to the original email). If you didn't answer anything or answered incorrectly - after XXX hours the message goes to / dev / null
I have a question - on which decision stack could this be implemented with little bloodshed?

Answer 1

My advice to you, do not make monstrous decisions. It is better to make 3 "Spam, possibly spam, inbox" folders. Such a decision will be even more useful than when the director of a large company sent a message, and in response to him "Your message has been quarantined, to prove that you are not a spammer, follow the link: ..."