Hello team., I’ve been searching the possibility to block an email’s domain.
For example:
A few people register with *@email-service3.com.
There are good people, I could ask them to change the email service, that’s ok… but, how could I block that email’s service for new registrations?
Is it possible?
Yup, add it to email domains blocklist in Admin > Settings
Yes!!! I always said it. You rock! 
Thanks CpRadio !
For others coming to this topic for reference as I did: I believe that this setting has since been renamed to blocked email domains and that it can be found under Admin > Settings > Login.
-Brad
@BradCray様、ありがとうございます。その変更を反映するように投稿を編集しました。「blacklist」と「whitelist」をメタ全体で検索する必要があるかもしれません。@tshenry、ビュー数で並べ替えて、不適切な名称の注目トピックを修正しましょう。