Visual Analytics uses the Identities service to pull user information from the LDAP server directly. Therefore, user information such as phone number, work address, and email address must exist in LDAP. In addition, only users have have logged in at least one can receive a distribution. If you could create a 'dummy' account in LDAP with the email address you want to use, and have an administrator use that account to log in at least once, you should be able to accomplish this.
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