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

[Richard Welty <rwelty at averillpark.net>]

On Fri, 7 Jan 2005 12:03:17 -0500 (EST) Seth Breidbart <sethb at panix.com> wrote:

> "Michael Kaplan" <mkaplansolution at lycos.com> wrote:

> > I was unclear.  What I meant was that it would be a simple matter
> > for and email provider to recognize a bounce sent via my system.
> > The email provider could then check to see if the recipient had
> > previously sent out an email to the supposed source of the bounce.

> How could panix check to see if I've sent email, using my
> sethb at panix.com address, via some other MTA (not in Panix's network)?
> I certainly can do that (though SPF would fail).

i happen to agree with seth, and don't think there's a good way of
handling this, but supposing you could, there's still another one that
comes next.

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.

i was going to do some back-of-envelope computations on sizing, but
this is your proposal, mitch, so why don't you do them and share the
results with us.

richard
-- 
Richard Welty                                         rwelty at averillpark.net
Averill Park Networking                                         518-573-7592
    Java, PHP, PostgreSQL, Unix, Linux, IP Network Engineering, Security


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