a fundamental problem with challenge/response anti-spam systems
a fundamental problem with challenge/response anti-spam systems. a fundamental problem with cr is that it implicitly assumes that your correspondent wants you to read their email more than you do. just look at who's doing the work: your
Challenge/Response = BAD BAD BAD!
Steve lists some anti-spam tools, including several which fall in the Challenge/Response camp. Now at first sight to the naieve user, C/R solves the spam problem at a stroke - all those spam messages I used to get - my system sends an
The Final Solution to Spam
I tried an anti-spam challenge-response program. This is software you put between your email client and your mail server. It constantly checks your mail server and sends challenges to senders that are not in its white-list.
Anti-Spam Tips, Tricks and Secrets
Employ one of the great anti-spam tools (eg, POPFile Spam Filter) that filter junk mail using all kinds of clever strategies. Don't Believe Spammers When They Say "You Requested" You can also use challenge/response spam filters.
Links Roundup
Spam e-mails increasing rapidly; John Levine: Challenge-response systems are as harmful as spam Spam volumes increase again; Mac Mail anti-spam tool ships ITC installs anti-spam software; Sendio Upgrades Anti-Spam Appliance
Zaep AntiSpam
Zaep AntiSpamZaep AntiSpam is a challenge based anti-spam system that can eliminate 100% of the spam you receive. Unlike spam filters, it does not use any kind of filter or content scanning, but uses a challenge response, a customizable
challenge-response anti-spam
i just got emailed by someone i'd never heard of; i replied. however, their mailbox is "protected" by choicemail, and so i got back a verification challenge. however, thunderbird marked it as junk mail so i nearly missed it. had i done
tmda-1.1.8-1 anti-spam system & local mail delivery agent, 10.4 tree
the tagged message delivery agent (tmda) is an open source anti-spam system and local mail delivery agent written in 100% pure python. tmda combines whitelists, blacklists, a challenge/response system, and special-purpose e-mail
anti-spam service advertising via spam.
and to top it off, their business model isn't very good or original — it's just another challenge-response system. also, i've already thought of two ways that spammers could game the system, although without seeing the fine details of
isps at risk over spam deluge, cautions security expert
growing numbers of businesses and individuals are complaining that the anti-spam solutions provided by their internet service than the far more effective challenge-response method, while some isps are not using an anti-spam system

Challenge/Response Spam Filtering Software and Services - About Email
At least that's what challenge/response spam filtering software and services Personal vqME Anti-Spam keeps your email Inbox free of unwanted mail by
Is Challenge/Response filtering a good or bad thing?
To help identify and stop these bugs, I wrote a white paper on best practices for challenge/response anti-spam systems. Buggy C/R that challenges replies,
Anti-spam for Exchange Server 2003, Exchange 2000, Exchange 5.5
Policy Patrol Spam Filter: anti-spam tool for Exchange Server 2003, Policy Patrol include un avanzato sistema di challenge/response e permette agli
SicurezzaInformatica.it: Challenge and Response, nessuna panacea
Dopo diversi anni in cui se ne parlava ho finalmente avuto una dimostrazione "live" dei tanto discussi sistemi antispam Challenge and Response.
Justin Mason: Happy Software Prole » The Problem with Anti-spam
A great summary of the issues surrounding challenge-response anti-spam systems, from Kee Hinckley on the ASRG list. Summary: they’ll work fine for

Is Challenge/Response filtering a good or bad thing?
To help identify and stop these bugs, I wrote a white paper on best practices for challenge/response anti-spam systems. Buggy C/R that challenges replies,
Anti-spam for Exchange Server 2003, Exchange 2000, Exchange 5.5
Policy Patrol Spam Filter: anti-spam tool for Exchange Server 2003, Policy Patrol include un avanzato sistema di challenge/response e permette agli
SicurezzaInformatica.it: Challenge and Response, nessuna panacea
Dopo diversi anni in cui se ne parlava ho finalmente avuto una dimostrazione "live" dei tanto discussi sistemi antispam Challenge and Response.
Justin Mason: Happy Software Prole » The Problem with Anti-spam
A great summary of the issues surrounding challenge-response anti-spam systems, from Kee Hinckley on the ASRG list. Summary: they’ll work fine for
Spam Blocker For Microsoft Outlook - Download MailFrontier
junk mail anti spam software spam software spam control email filter block spam phishing Challenge/Response – challenge all, some, or none of your email
IceWarp Italia - Merak - Modulo Instant Antispam
Il modulo Merak Instant AntiSpam (MIAS) è la soluzione antispam più completa e potente Meccanismo Challenge/Response. Questa funzionalità consente di
[Antispam] Challenge/Response
[Antispam] Challenge/Response. Andrés Taylor andres.taylor at gmail.com Thu Jun 24 16:14:44 CEST 2004. Previous message: [Antispam] Spamassassin vinner test
ISP-Planet - Equipment - Addressing an Anti-Spam Challenge
Founded last year, Gennux is no "first mover" in the anti-spam space, but its intriguing ideas solve some problems that other challenge-response systems