Greetings, Robert Moskowitz!
If I user formail to -I replace the From-Header, formail creates a From-mbox line where the sender is foo@bar. That's the default if there's no valid From: in the incoming message. There IS a From: in the original message:
From: "(Cron Daemon)" <rgm> That's not a valid From: address since it doesn't have a domain name.
Ah, I will take your word for it. I could never grok 822.
https://tools.ietf.org/html/rfc5322#section-3.4.1
It is what cron is doing, though. Why put something in broken? It could have done rgm@localhost.
Which is about as "useful". I'd rather like <cron@`hostname --fqdn`>
One more thing to include in my cron bug report. Already going to complain no Date: as to when the cron task started. All you can do is stick in a Date: header of when the task finished.
-- With best regards, Andrey Repin Thursday, May 14, 2020 17:45:59 Sorry for my terrible english...