@JeremyNicoll: I'm having a little trouble understanding what you are saying (no doubt, due to my ignorance).
I (think I) understand that when emails are sent out with BCC addresses, the sending system makes sure that recipients have no way of identifying the other recipients of the same email message. So, it makes sense that the "sent" copy retained by the sender's system is not the same as what is sent to the recipients.
What I don't understand is how the above relates to what is going on in my case.
I have gone to FM's Sieve tester, and put in my (entire) Sieve code as well as the entire raw "Undelivered mail" message that FM delivered to me. The results of the Sieve test are that the message should be silently deleted, not retained.
If an earlier rule were processing the "Undelivered mail" message, wouldn't the Sieve tester tell me that the result of my Sieve code on the raw message was to have the email retained rather that deleted?
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