Robert A Rosenberg <hal9001(_at_)panix(_dot_)com> writes:
OK - Not a Rule but only the usual occurrence with <> messages such as
"can not deliver" messages. If those functions that generate
multi-recipient messages with a <> from would just create a separate
copy for each recipient it would make SPAM detection (of <> messages)
much easier since any attempt to deliver such a multi-recipient <>
message would be trappable without needing to bother asking if it was
possibly a legitimate message or SPAM.
If you set up a digital camera to sound an alarm whenever anyone enters
your house wearing plaid, since no one you know wears plaid, you'll also
be quite effective at detecting any attempts by plaid-wearing burglars to
rob your house.
However, if everyone does this, burglars will just start wearing stripes,
your system will become useless complexity, and several years later after
you've forgotten all about it, you'll end up putting your Uncle Albert in
the hospital with a heart attack due to an unfortunate fashion choice.
Russ Allbery (rra(_at_)stanford(_dot_)edu)