Postfix Integration - Run another filter first

[Joseph Jamieson]

That would work (maybe) although I suck at perl if there's any advanced
coding required.   As long as the code isn't too complicated I *think* I
could get by.   I'm not a programmer by trade but I can write some php
and bash scripts.

If this were to work ideally, I'd be able to use a custom scanner within
MailScanner which will add some header tags which could then be picked
up by SpamAssassin - meaning, it will integrate better into the system
as I can add it as a score line item.   I like the idea of integrating
many different techniques into a single scoring system.   It helps
reduce false positives and reduce spam.  I hate letting a single
technique block messages altogether - such as RBL blocks or dynamic IP
ranges.   Much rather have those things add a few points to the total
score.

Am I right about the postfix/filter order though?   Does postfix send
messages to the HOLD before running the other items listed in master.cf?

-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Julian
Field
Sent: Thursday, August 07, 2008 4:14 PM
To: MailScanner discussion
Subject: Re: Postfix Integration - Run another filter first



Joseph Jamieson wrote:
>
> Greetings,
>
> I'm pretty new to MailScanner, but I do have a working system and it 
> works.
>
> I am having trouble tracking down a few bits of information, though - 
> and this is mostly a Postfix question but I figured someone here might

> know.
>
> MailScanner uses the Postfix header-checks "HOLD" feature to scan the 
> messages. Postfix drops the message into the hold folder, and every 
> few moments MailScanner will check the folder, scan all the messages, 
> and then drop it into a folder for postfix to grab and continue 
> sending the message on its way.
>
> At what time in the process does Postfix do this? It appears that 
> postfix will do this before pretty much anything else. So, if I have a

> filter set up in the master.cf (for instance, dspam) MailScanner 
> always gets a hold of the message first. What if I wanted to use dspam

> to tag a message probability, and add some scores to SpamAssassin 
> (which is run by MailScanner?) That way, MailScanner remains the only 
> system that's doing any tagging, quarantining, etc.
>
> DSPAM is just an example. I can think of several other nice little 
> things I'd like to be able to do, too.
>
> So, I guess the question is: Is there any way to run a filter via 
> Postfix **before** MailScanner gets its turn? Or do I have it all 
> wrong here?
>
You could implement DSPAM (or others) as a generic virus scanner or a 
custom spam scanner within MailScanner. How about that approach instead?

It will take you a bit of digging in the MailScanner code to implement, 
but the hooks are there, and I probably even wrote you some sample code 
in CustomConfig.pm or
/usr/lib/MailScanner/MailScanner/CustomFunctions/*.pm.

Jules

-- 
Julian Field MEng CITP CEng
www.MailScanner.info
Buy the MailScanner book at www.MailScanner.info/store

MailScanner customisation, or any advanced system administration help?
Contact me at Jules at Jules.FM

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