mail message charging? + nanog digest

[Allan Chong <allan () alum mit edu>]

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