Gets a value indicating whether the membership provider is configured to require a unique e-mail address for each user name.
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The MembershipProvider.RequiresUniqueEmail property indicates whether users must supply a unique e-mail address value when creating a user. If a user already exists in the data source for the current MembershipProvider.ApplicationName, then the MembershipProvider.CreateUser(string, string, string, string, string, bool, object, MembershipCreateStatus@) method returns null and a status value of MembershipCreateStatus.DuplicateEmail.