How to blacklist domains
You might want to exclude specific domains from signing up onto your list.
You can easily achieve this in Maître by adding domains to your blacklist, which you can find under Settings > Advanced settings.
Just add one domain per line and make sure you only add the domain name and extension, without www or http.
After you add a domain to the blacklist, people who try to sign up using that domain will get a "This domain is not valid." error.
PS: Blacklist is currently a PRO and Premium feature. Upgrade your account to use it.