How to make spam protection when sending multiple emails from a website?

Question

Django

Hello everyone,
Are there ready-made batteries for implementing spam protection during some action on the site. For example, I don't want a human or robot to be able to send more than two emails in a certain amount of time, or to perform some action. At the same time, I do not want to add any captchas to the site, which only spoil the impression of real users. What are the existing solutions?
Right now I'm making a very straight forward solution. I write the IP address to the cache with an action when an action is performed, and if there is a similar action from a similar IP address, then I block it. But his directness scares me a little, and I'm looking for more interesting solutions.
Thank you.

Answer 1

And there are no normal methods. All crutches and only. Almost everyone has the same implementation - restrictions on the session, user, ip, network, look at behavioral factors. But there will always be a bot that will bypass your protection.