[keycloak-user] Curious about the Email constraint on UserEntity

[Adil Arif]

I have been testing Keycloak (1.1.0 Final) federation ability against some of our existing user databases. I came across the unique email address constraint in the UserEntity table. What is the reasoning behind email addresses being unique?

Our particular use case is that a user can create multiple usernames and have the same email address across many of them if they choose to.
Adil Arif
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