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Date:      Tue, 02 May 2000 17:31:57 +0200
From:      Len Conrad <lconrad@Go2France.com>
To:        freebsd-isp@freebsd.org
Subject:   Re: orbs/rss/rbl/dul blocker after headers?
Message-ID:  <4.3.1.2.20000502172552.00e365f0@mail.Go2France.com>
In-Reply-To: <Pine.BSF.4.05.10005020733140.27167-100000@arnold.neland.dk >

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>Is it possible to put the dns-based lookups later in the conversation,

go postfix, it has very fine grained controls for spam,

http://postfix.eu.org/uce.html

including delaying 5xx msgs until later in the dialog.

>  so
>instead of the senders getting blocked already when trying to connect,
>they get blocked just before the DATA.

>So sender and reciever gets logged?

postfix has the option of sending a pretty-printed session dialog to the 
local postmaster.

>That would also make it possible to send a longer message by mail than the
>errormessage, which people often don't understand.

You could some perl in an alias behind local postmaster that forwarded a 
copy of the postfix session transcript to the "mail from:" address, since 
the session transcript will typically only show up in the SMTP client logs, 
not all the back to the "mail from:". btw, if you do this bit of perl, I'd 
appreciate a copy.

We love postfix here.  Even built an entire anti-spam front end out of it:

http://IMGate.MEIway.com


for the Ipswitch Imail crowd, but the concept applies to any mail server.

Len




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