Re: [Asrg] Please critique my anti-spam system

On 2005-01-08 13:15:07 +0100, Peter J. Holzer wrote:
> On 2005-01-07 20:02:31 -0500, Seth Breidbart wrote:
> > > for a sufficiently large ISP (think AOL, or a cable modem business),
> > > keeping track of the tuples of <sender, recipient> for any length of time
> > > will require a _substantial_ database infrastructure.
> > Under 1K of data.  Remembering stuff is doing it the hard way.  Create
> > the lhs of the Message-ID signed with a private key that changes
> > daily.
> That assumes that the Message-ID is created by the MTA. Many MUAs create
> the Message-ID themselves, and the MTA should not (indeed must not, per
> RFC 2476 and 2821, if it is syntactically correct) replace it, because
> that would make the "In-Reply-To" and "References" headers useless.
However, the ENVID introduced in RFC 1891 (current version: RFC 3461) 
may be generated in that way.

Would that be feasible? 

* Do MUAs generate ENVIDs?

* Which percentage of bounces contains the ENVID?

Looks like I should do a bit of research on our mail server :-)

        hp

-- 
   _  | Peter J. Holzer    | Je höher der Norden, desto weniger wird
|_|_) | Sysadmin WSR       | überhaupt gesprochen, also auch kein Dialekt.
| |   | hjp(_at_)hjp(_dot_)at         | Hallig Gröde ist fast gänzlich 
dialektfrei.
__/   | http://www.hjp.at/ |   -- Hannes Petersen in desd

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