[...] the statistics of mail volume [...]
alone its useless, combined with other "triggers" its still useless.
I disagree. If I were setting up my ideal ISP, one thing it would
include is watching the outgoing email volume from each account. A
sudden spike would cause throttling and flagging for human attention.
The human could then reopen the throttle, block the account, check with
the owner, whatever.
"Useless"? Maybe. I haven't had the luxury of being able to try it.
But I suspect it wouldn't be.
As Alan said, did you actually read the message you're responding to?
It looks more as though you picked out one point, carried it to an
extreme not supported by the message you took it from, and then argued
against that extreme.
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