Disposable Email Blocking

I am in the process of evaluating Cleantalk and am trying to figure out how to block disposable email domains like spamgourmet.com as well as gmail.com, hotmail.com and other free personal email domains. I was not able to find much documentation on this topic. I tried adding the email domains in a personal blacklist (*.gmail.com) as is described in the manual, but received the following error: “*.gmail.com – Wrong format”. When I search spamgourmet.com and other temp email domains in the Cleantalk database they come back clean.

How do I configure disposable email domain blocking?

Thanks for your help!