As far as I understand the feature where a magic link is sent if there was an attempt to register an already existing user has not been implemented yet. Here is the open issue https://github.com/supabase/gotrue/issues/286

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Any ETA or workaround we can deploy for now?

Evaldas_B (2022-04-19)

I've seen people creating a table that contains all the existing emails and checking before signUp() if the provided email is not in that table. That would expose all your registered user emails.