Re: regarding spam...

[Adam Shostack <adam () homeport org>]

Back when we were building anonymous networks at Zero-Knowledge, we
worried a fair bit about being a source of spam.  We limited outbound
messages to 250 recipients per day, and refused service for additional
messages.  Very few legit users ran into this, and most of our
spammers did.

It seemed to work really well, and it was a really simple hack to
qmail.


Adam


On Tue, Apr 02, 2002 at 07:36:19AM -0500, R. DuFresne wrote:
| 
| This could be simplified if smtpd daemons would log such information as
| number of send To's, Cc's and Bcc's.  Counts, not all addressing would 
| be a good alerting mechinism, a heads up to the admin to peek further
| for possible action.  Then an administer could parse a logfile to
| determine possible spamming
| 
| On Mon, 1 Apr 2002, Crispin Cowan wrote:
| 
| [SNIP]
| 
| > 
| > If there was a product that such large providers could deploy at their 
| > gateway that filtered *outgoing* mail, and the only thing it did was to 
| > bounce a copy of suspected outgoing spam back to the senders inbox, then 
| > a spammer's inbox would fill to bursting almost immediately, and the 
| > provider could lock out their account from sending any more mail until 
| > the issue was resolved.
| > 
| 
| [SNIP]
| 
| > 
| > I know: this requires very low margin providers to expend more effort, 
| > and we already know that they don't put much effort into spam fighting. 
| > This egress filter proposal is an attempt to minimize their effort 
| > required for effectivenss, and thus hopefully reduce their costs in 
| > dealing with spam cleanup efforts, e.g. the thousands of complaints that 
| > pour in after a large spam incident.
| > 
| > Presumably some of the readers out there are in companies in the content 
| > filtering business. Consider this a product opportunity.

-- 
"It is seldom that liberty of any kind is lost all at once."
                                                       -Hume


_______________________________________________
firewall-wizards mailing list
firewall-wizards () nfr com
http://list.nfr.com/mailman/listinfo/firewall-wizards