mail message charging? + nanog digest

Allan Chong allan at
Tue Sep 2 14:16:42 UTC 1997

After the latest round of spam in my mail box from throwaway accounts
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
	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
	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
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 at
>     Altavista Hacked ? ("George J. Broadfoot III" <george at>)
>     Re: Altavista Hacked ? (Philip Steffora <steffora at>)
>     Re: Anyone Deployed Ascend's GRF IP Switch? ("Gary E. Miller" <gem at>)
>     Digital's Altavista NOT hacked! (Philip Steffora <steffora at>)
>     Re: Altavista Hacked ? (jbodkin at (Jimmy Bodkin))
>Date: Mon, 1 Sep 1997 15:09:29 +0000
>From: "George J. Broadfoot III" <george at>
>Subject: Altavista Hacked ?

Allan Chong		allan at

Eisenhower was very nice,
Nixon was his only vice.
                -- C. Degen

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