Re: Anti-Spam ideas for usenet/list harvested email addresses
From: Paul Johnson (baloo_at_ursine.ca)
Date: 09/26/03
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Date: Fri, 26 Sep 2003 01:26:14 -0700 To: debian-user@lists.debian.org
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On Tue, Sep 23, 2003 at 01:16:38PM -0600, Jacob Anawalt wrote:
> To me the big question is how do I avoid the spam in the first place,
> besides avoiding email all together?
Become an extremely hostile target. Report all mail and news abuse
ASAP. http://spamcop.net/ and http://www.abuse.net/ are both
excellent resources for getting ahold of admins.
If you run your own mail server, exim has excellent controls for
curbing spam. exim4 and sa-exim work beautifully together. I'd love
to know how to get clamav to work, maybe this would be a good feature
for sa-exim.
> We've all done or seen people do this: jacob at cachevalley dot com,
> jacob.nospam@cachevalley.com, jacob@cachevalley.nospam.com, etc.
Munging considered harmful.
http://www.interhack.net/pubs/munging-harmful
> I've already mentioned the web authorization idea and the rotate your
> email address on some schedule ideas in another thread.
Challenge-response considered harmful, read the archives. Rotating
your email address is another great way to lose legitimate email
without affecting the problem itself.
> I've even seen a web site go so far as to use a .js file function to
> put together the email address from a bunch of fragments when you
> click the mailto link. That would take more work to parse, but it is
> still possible by having an email grabbing webbot that can run
> javascript.
Not to mention break the functionality for people who do not have JS
capable browsers.
> The mail server would need to have access to my personal list of
> acceptable email addresses so it could give a 550 with the appropriate
> extended SMTP code for unauthorized/security and an appropriate error
> message after the HELO and MAIL FROM and RCPT TO: have been given. It
> should only do this for mail accounts that have entries in the safe list.
> If your list is empty, all email is valid. If you have one or more
> entries, only those ones can send you email.
spamassassin does something similar with sa-exim.
> If you're sick of getting swamped (as a user or admin) wouldn't this setup
> be usefull? An ISP could encourage users to use username.lists@isp.com for
> email addresses that are going to be used on usenet or public mailing
> lists. The new email address could just dump into the real address after
> the mailing list rules were validated, or it could be it's own account and
> mailbox.
Variation on munging...
> The sad part is that I've already squandered my username at this email
> address by putting it where it can be harvested in mass by worm/virus and
> UCE/UBE collection scripts, and I had already read an article cautioning
> me against this. Oh well live and learn (someday I'll learn anyway.)
I've had this email address for about a year, and before that, I had
baloo@ursine.dyndns.org for about 6 years before a buddy bought me a
Canadian domain name for me. Don't hide, *TAKE ACTION*.
- --
.''`. Paul Johnson <baloo@ursine.ca>
: :' :
`. `'` proud Debian admin and user
`- Debian - when you have better things to do than fix a system
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- Previous message: John L. Fjellstad: "Re: Son of Swen?"
- In reply to: Jacob Anawalt: "Anti-Spam ideas for usenet/list harvested email addresses"
- Next in thread: Pigeon: "Re: Anti-Spam ideas for usenet/list harvested email addresses"
- Reply: Pigeon: "Re: Anti-Spam ideas for usenet/list harvested email addresses"
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