You can click on the Google or Yahoo buttons to sign-in with these identity providers,
or you just type your identity uri and click on the little login button.
make sure addresses email@example.com and ToTo@toto.com are considered equal.
done for index by author
Ticket #2995 - latest update on 2010/10/13, created on 2006/11/07 by Sylvain Thenault