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From: Ken Raeburn <raeburn@cygnus.com>
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Subject: Re: gnus chokes on this junk mail
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Russ Allbery <rra@stanford.edu> writes:

> It just takes a lot of time (upwards of five to ten minutes on my
> machine).  An unavoidable side effect of slow regex matching, I think,
> although one could argue that Gnus should simply bail on attempting to
> match anything with a To header over a certain length.

Or split the header into managable chunks for matching.

> I've considered just procmailing such messages away, as they're invariably
> spam.

Almost.  I've seen mail recently with a large "to" header because the
sender wanted to ask the maintainers of a large set of programs about
distributing those programs or some such.