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From: Ken Raeburn <raeburn@cygnus.com>
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Subject: Re: spam filtering on message-id (was: Hmm.. 2 q's)
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Michael R Cook <mcook@cognex.com> writes:

> >>>>> "RS" == Randal Schwartz <merlyn@stonehenge.com> writes:
>  RS> I know the *right* side (or rightmost side if multiple) of the @
>  RS> has to be a valid hostname, so you could filter on (perl regex):
>  RS> 	Message-Id: !/\@([-a-zA-Z0-9]+\.)+[a-zA-Z]{2,3})$/ { DELETE; }
> Unfortunately, I get a good amount of non-spam that has invalid
> message-ids.  So much for standards. :-(

So maybe the solution is not to discard, but to bounce, thus pestering
people with broken configs.

For that matter, anyone have Gnus code to generate an official-looking
"bounce" reply to a message?