Does WPDiscuz have email validation? I am getting spammers commenting with fake emails like test@ abc.com, email@example.com, etc.
The email validation is being checked by email format. That is the email must contain the @ symbol and some kind of .com etc. There is no easy way to validate such kind firstname.lastname@example.org of emails.
I may suggest you check out this FAQ: https://wpdiscuz.com/community/f-a-q/how-to-protect-comment-section/
It should be helpful for you.