After the latest round of spam in my mail box from throwaway accounts plus a spate of damn junk faxes..... Anyone implemented per message limits on SMTP mail? 1) a billing structure that allows say 1000 outgoing mail messages and either charges or shuts off the account beyond that. I wrote a series of scripts that injected each syslog mail entry into a Sybase database in real time at a previous job. 2) filters on dialup accounts that prevent SMTP connections to anything but the local SMTP server (much as there are spoofing filters on most dialup routers nowadays) 3) you'd have to authenticate your SMTP connections, which if they're from your local dialup pool, should be nothing more than checking your real time accounting database. (most ISPs aren't running real time accounting, but probably should be just to prevent multiple account abuse). A feature rich Radius server seems to be sorely lacking. This seems to be one piece of software that many large ISPs are writing on their own. 4) you could always allow "good" customers access through if they really needed SMTP access for some reason or another. The basic idea would be to get rid of the damn $20 dialup accounts most of the spam that is hitting my mailbox seems to be coming from. Anyone see any gaping flaws in this logic? BTW, there is a nanog digest going out twice daily. I'm willing to add any procmail filters for anything that will increase signal to noise.
nanog-d Mon Sep 1 22:57:01 EDT 1997
This unofficial procmail'ed digest sponsored by Allan Chong. Please mail subscribe/unsubscribe requests to allan@alum.mit.edu
Contents:
Altavista Hacked ? ("George J. Broadfoot III" <george@laserlink.net>) Re: Altavista Hacked ? (Philip Steffora <steffora@av-ops.pa.dec.com>) Re: Anyone Deployed Ascend's GRF IP Switch? ("Gary E. Miller" <gem@rellim.com>) Digital's Altavista NOT hacked! (Philip Steffora <steffora@av-ops.pa.dec.com>) Re: Altavista Hacked ? (jbodkin@attmail.com (Jimmy Bodkin))
----------------------------------------------------------------------
Date: Mon, 1 Sep 1997 15:09:29 +0000 From: "George J. Broadfoot III" <george@laserlink.net> Subject: Altavista Hacked ?
-- Allan Chong allan@alum.mit.edu Eisenhower was very nice, Nixon was his only vice. -- C. Degen