Called by:
Mobilizon.GraphQL.Resolvers.Admin.do_change_email_different
(L371)
Mobilizon.GraphQL.Resolvers.Participant.valid_email?
(L437)
Mobilizon.GraphQL.Resolvers.User.do_change_mail_new_email
(L538)
Mobilizon.Web.Email.Checker.validate_changeset
(L20)