I'd prefer to have it recorded in the header for comparison against the logs when there's inside e-mail abuse.
The IPs in the logs of the mailbox server and the SMTP outbound gateway are sufficient for tracking down internal routing. They are of course more reliable than headers, which we always say here are not to be trusted.
And here, Imail's own SMTP dialog could help if Imail would announce in the "2xx mail accepted" response the Imail msg ID.
Len
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