Dr. H.
> ... the bot's reply uses In-Reply-To and duplicates the subject line
> from a prior legitimate email.
There's your hook: the subject line.
The trick is to figure out how to put a short nonce in each outbound
subject line. Maybe just member serial number, but something unique to
the recipient.
519 members is only three characters, two if you base-26 it.
I suppose that might play havoc with email interfaces that thread by
subject line.
Shal
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