Steven Orr asked,
I want people on A to not be allowed to send a single message to both A
and B. I someone sends to both A and B it should hit procmail and
automagically be send only to B.
After reading Sean's reply (and Kreemy's), I still have this to say: how
do you prevent a member of A who is also on B from posting separate
dispatches of the same text [or a slightly altered text] to A and to B?
After all, you said that members of A are "allowed" -- not required,
just permitted -- to subscribe to B. Therefore, there might be people
on A who have declined to join B, and a post to both A and B will reach
people who will not see a post to B alone. So the logic behind your
policy escapes me. What if a member of A and B really wants everyone on
A, even those who don't belong to B, to see the post? If you find a
way to get a single dispatch to both posting addresses to be distributed
only to B, the person will just send a separate copy to A. If you take
checksums of the body and keep a cache of those (and that will help only
if the copy to B arrives first, or if you put a delay on all posts to
A), a determined poster can easily make a small change in the text and
send a negligibly or even imperceptibly different version that produces
a new checksum.
It is vanity, an attempt to herd the wind.
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