Re: [tlug] General procmail question

[Godwin Stewart <gstewart@example.com>]

On Sat, 4 Jan 2003 13:25:29 +0100, Godwin Stewart
<gstewart@example.com> wrote to Tokyo LUG <tlug@example.com>:

> What I therefore need to do is get procmail to use mfilter.pl somehow.

For those who are interested, I cracked it with a small program in C I
called "chkmail".

I've edited my sendmail.cf so that local delivery no longer happens through
procmail but through chkmail instead. chkmail is invoked with exactly the
same command line parameters as procmail. What it does is:

1) Make a note of the command line parameters with which it was invoked.

2) Read the incoming mail from stdin and separate headers from body.

3) Add an "X-PassedThrough:" header so I know it's been processed by
chkmail.

4) Pass the headers through my super-duper spam-stomping Perl script and add
my (in)famous "X-SpamTagged-By:" header if it is spam.

5) Invoke procmail with the command line parameters noted in 1) and pipe the
new headers, then the body through it.

If procmail sees the "X-SpamTagged-By:" header it'll divert the mail to a
"spam" mbox.

Since this filtering now takes place upon local delivery, all three ways a
mail can get into my box are now protected.

Time for bed :)

-- 
G. Stewart   --   gstewart@example.com
                  gstewart@example.com
Registered Linux user #284683

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