join meeting in progress button

[dprisoner]

Apparently users can register when the meeting is in progress and join directly from the sign up page. Is there a way to make them have to wait for the email. I ask this because it appears that Zoom bombers can just join without using their own, or even a valid, email address (we had someone with a single letter name at yahoo.com, and another that used a couple variations of the same name and gmail.com).