[Exim] why not let users :fail:?

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Szerző: WJCarpenter
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Címzett: exim-users
Tárgy: [Exim] why not let users :fail:?
Docs (and books) for both Exim 3 and 4 say, in effect, "Here's how to
allow 'fail' and 'freeze' actions in user filters, but don't do it if
users actually control their own filters."

I can see how there's not much motivation for allowing users to freeze
messages, but what's the danger in allowing users to fail messages?
Is this a philosophical position ("admins rule!"), a technical
limitation ("if you allow that, there are certain mumbles that are
very hard to detect and overcome"), or middle ground ("many users
don't know what the heck they're doing and will embarass themselves or
the entire domain if they try using this feature")?

If a user wants to fail a message with a SpamAssassin score of 114 or
more, why shouldn't I let them?
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