<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_1_1428354560749_2611">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?<br></div><div id="yui_3_16_0_1_1428354560749_2679" dir="ltr"><br></div><div id="yui_3_16_0_1_1428354560749_2700" dir="ltr">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.</div><div id="yui_3_16_0_1_1428354560749_4301" dir="ltr"><br></div><div id="yui_3_16_0_1_1428354560749_4334" dir="ltr">Adil Arif<br></div></div></body></html>