[Gllug] How can I revert a mail digest?

[Stig Brautaset]

* tet at accucard.com <tet at accucard.com> spake thus:
> 
> >> 	(formail|procmail(ex|rc)?)
> >
> >Yeah, I knew that. Or even
> >
> >	formail|procmail(ex|rc)? 
> >
> >would do (stripping off your superflous paranthesis :-) )
> 
> Actually, they're not superfluous. They're needed in order to correctly
> bound the alternates specified by the pipe. Without them, you'd incorrectly
> match:
> 
> 	formailrocmail
> 	formaiprocmail

Actually, no. This is not true when it comes to procmail, if you are to
believe the procmailrc man page, which explicitly states (under the
heading "Extended regular expressions");

	de|abc    Either the sequence `de' or `abc'.

However, most other places I think your above statement might well be
true. I am no expert in regular expressions, but lately I have played
with procmail to weed out followups to known spams in a mailinglist. It
is a known fact that such followups often are more numerous than the
initial spam. I have indeed managed to make such a filter that works
quite well[1]. If anybody is interested, I'll post the recipe here. 

[1] It breakes where broken mailers fail to include a references or 
in-reply-to header.

Regards,
Stig

-- 
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