Re: learn procmail and quit whining already (was Re: Debian lists and Cc'ing people in replies in addition to the list)
Louis-David Mitterrand <vindex@apartia.org> writes:
> 3) you have the option of having a separate dupe cache for each mailing
> list:
>
> :0 Whc: msgid.lock
> | formail -D 8192 msgid.$LIST
You do realize this creates a fairly easy way for people to abuse your
filter? If an attacker can predict the Message-ID of an email someone
is going to send to you, then they can easily send you a message with
that Message-ID, and your filter will happily delete their mail when
it arrives, and you will be none the wiser. Many people's Message-IDs
are fairly easy to predict.
I don't see the point of complicated and fragile mail-filtering when
the problem could be solved in the first place by just not sending
duplicate messages.
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