email on a ClientInvitation is the primary identifier for the invited external user. The invitation link is sent to this address, and when the user accepts, their account is associated with it. Compliance staff verify the email carefully before sending because it determines who gains portal access. Administrators can search existing ClientInvitations by email to check whether a particular contact already has an active or pending invitation for a site.
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Invitation Email
`email` on a ClientInvitation is the address the invitation is delivered to, and the identity used when the recipient accepts.
