Block specific email domains: We're getting a lot of sign ups from protnmail, simplelogin, suremail, mailbit, passinbox, 8shield, and other secure or temporary email services that lower the quality of our users. Is there a way to set a list of "do not allow" email domains for email sign up? I know a lot of sites do detection on the email domain during signup to make sure you're using a "good" email. It would be better if there were some sort of proactive feature to signal email address "quality" during signup, but a s imple "do not allow" list would probably do the trick at least for now. Though there are hundreds of these types of services so might be difficult.