[Spambayes] Re: Filter Based on Recognized Email ISPs - Bounce Back Spam to Sending IP Address

[Mathew Hendry]

On Sun, 14 Nov 2004 12:36:26 -0700, "The Webers" <weber201 at npgcable.com>
wrote:

>Couldn't a front end app could be developed that: 
>
>1.	- Contains a list of all recognized Email providers (Yahoo, MSN,
>NPGCABLE ..)

You mean something like http://www.senderbase.org ?

>and allow that Email to come through
>2.	- provide option to filters on userid, subject, text.

Okay, there are plenty of filters that can do that. Most e-mail programs
have such features built in.

>3.	- Email NOT passing that filter be rejected back to the sender but
>send a copy to a separate folder for user to review and add Email address to
>filter to allow future Email from that specific user to pass through.
>4.	Email not passing the filter should be analyzed to find the sending
>IP and bounce it back to the route it came from.  This might help getting a
>portion of the spam stopped or at least place less work on the recipient.

It doesn't make much sense to talk about bouncing to an IP address: bounces
are e-mails, sent to an e-mail address. The problem is, which e-mail
address? Bouncing to the claimed sender is of course a bad idea, because
spammers invariably forge this information. For more on this see
http://spamlinks.openrbl.org/filter-bounce-fake.htm .

OTOH, http://www.spamcop.net sounds close to what you're after. It doesn't
send bounces; it sends complaints to the ISPs responsible for the offending
IP addresses. Repeat offenders are added to an IP blacklist available to
anyone through the bl.spamcop.net DNS zone.

Combine that with a filtering program that can be configured to refer to
bl.spamcop.net, spamassassin for instance, and you're set.

-- Mat.