It's already doable. Set forbidden words for the email field. Just add yahoo, gmal, hotmail. To the forbidden words list for registration and edit box.
Then if either of those words exist. It won't validate and they'll have to enter the proper email, tada.
Don't see why you want to stop email providers of like 95% internet users. Just going to hurt you IMO, but up to you.
Anyway, that's how ya do it. Good luck!
Kyle (Krileon)
Community Builder Team Member
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krileon
