An email gets sent from a specified mailbox name within the application to the specified recipients. The mailbox name that's specified is appended to the application's domain name to form the e-mail address of the sender. The recipients can be specified by their email address, by using their Microsoft Health account unique identifier, or by specifying the health record unique identifier. If the health record unique identifier is specified, then all custodians of the record will receive the message. This method returns an error if the application's domain name hasn't been previously defined (usually part of application registration). Contact the Microsoft Health Partner team at: firstname.lastname@example.org if this has not been set.