Postfix question : how to make Postfix scan messages selectively

[Jacques Caruso]

Hi,

I've seen that the new method to use MailScanner with Postfix is to have 
a single Postfix instance running, and holding messages by matching an 
always-present header (<http://minilien.com/?I7hiibA85b>). I'm 
currently running MS 4.29.7 with Postfix 2.0.16 on Debian Sarge in 
split mode (with two Postfix instances), and with a twist : I have 
limited what is deferred, so as to not scan messages that are to be 
relayed to another server, for instance. That is to say, I've this 
in /etc/postfix.in/main.cf :

defer_transports = local, virtual

Thus, any outgoing message (smtp transport) or relayed message (relay 
transport) is not scanned.

So, the question is : is such a setup achievable with the new 
single-instance Postfix setup ? If so, does anyone knows how ? I don't 
see any header that would do the job, it would probably need a more 
complicated (and probably buggy) regular expression. If it is not 
possible to do this easily, will the old split method continue to be 
supported in upcoming versions ?

Another problem that I see is, this will require Postfix to analyze each 
message's headers. Am I right in thinking this will have an impact on 
the load of a busy server ?

Cheers,
-- 
[ Jacques Caruso <jacques at monaco.net>                  Développeur PHP ]
[ Monaco Internet                           http://monaco-internet.mc/ ]
[ Tél : (+377) 93 10 00 43                        Clé PGP : 0x41F5C63D ]
[ -+-   Rappelez-vous que vous êtes unique. Comme tout le monde.   -+- ]

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