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The ExternalSourceType enumeration values indicate the nature of the source of the message.
The nature of the external source is unknown.
A remote user.
A forwarding proxy.
A federated peer that is configured using the domain and fully qualified domain name (FQDN) of the server in the Allow list on the Access Edge Server.
A clearing house.
If generated locally by the Access Edge Server.
A federated peer configured as an IM Provider on the Access Edge Server.
A federated peer that is configured using only the domain in the Allow list on the Access Edge Server, or a federated peer discovered through DNS SRV.