This test add-in inserts a fixed, fictional signature when a new message, reply or forward is composed. It is not connected to the administration prototype or a directory.
Install only for designated test accounts after validating the manifest and HTTPS runtime endpoints. Existing signature content may be replaced by the Outlook signature API. Draft reopen, sender changes, aliases, shared mailboxes and mobile are not covered by this experiment.
No message bodies are uploaded by this code. An insertion callback is not proof that a message was sent or received. Remove the add-in after testing.