You're welcome to use whatever you like on your systems, but FYI here's a
post I made on the iserver list regarding challenge-response systems:
-------
1)As a business, if someone signs up for my newsletter, I'm going to be
assaulted with many of these 'challenge' emails to send out every time I send
a new issue. Some systems require that you re-send the email from a specific
address with a key-code in the subject line. For a large automated list using
mailman or majordomo, this can be cost-prohibitive and will probably result
in me not completing any of them.
2)What if my online store sends an email receipt which gets blocked by a
challenge response system? I don't want to take the time to reply to all the
challenges, and then a customer complains that he never got his receipt, or
figures that it didn't go thru and places the order again, etc., etc.,
3)What if a virus sends this person an email, and it bounces with the
challenge to the original virus victim? (or a third party?) What if THAT
person has a challenge system and sends a challenge BACK to the first
recipient. Will this create a mail loop? If not, how does the challenge
system detect that it is another challenge and not send a reply? how long
will it take for spammers to figure out that system to get their emails to
bypass the challenge system?
4)As a consumer, if I'm trying to contact a business, I don't want the 3rd
degree when trying to buy Something. Think about the dial-up user: They
send an email, get off line until the next day, when they find that they have
to send a challenege response back just to make their FIRST email (from
yesterday) get delivered, which is just frustrating and will negatively
impact their feeling of this business.
5)As an ISP/mail host, some spammer uses your domain as a reply-to address.
So you get all these challenges to emails you never sent that you now have to
sort thru one-by-one, since you're not sure which of them are real and which
are as a result of a spammer abusing your domain name.
True, no system is perfect, but I'd much rather take my chances with
spamassassin letting spam thru then deal with a '100% spam solution' (their
words) that has these major problems with them.
--------
Also, here's an old but still valid opinion from CNET:
http://news.com.com/2010-1071_3-1009745.html
Have fun!
Matt
At 8:38 AM -0700 1/17/05, Jonathan Duncan said something about:
This was discussed a while back. Which, if any, Challenge Response Systems
(CRS) are people using and liking? spam.abuse.net refers to Spam
Interceptor as something that works with SpamAssassin but just glancing
over the site did not indicate to me how.
http://si20.com/
I think that qmail has some built-in challenge response options, but qmail
is not something that I relish moving to.
It looks like Spam Interceptor takes the mail off my server and people get
their mail there. I would like to keep mail on my servers. Does anyone
know of a good CRS's that rule either on the server or on the client?
Thanks,
--
Jonathan Duncan
http://www.nacnud.com
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Matthew I. Cohen http://www.iwbyte.com/
It Won't Byte Web Design & Hosting. Ob. Quote: "Reality is for those
email: lists@xxxxxxxxxx people who can't handle Fantasy"
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