[olug] SPAM, Viruses, and forged mail headers

[Nick Walter]

Hmm, interesting enough idea.  Some mail servers already can test for
impersonation using DNS checks on the connecting address (both forward and
reverse lookups) to make sure it's from the domain the e-mail claims to be
from.  Unforunately, such restrictions are easily worked around by simply
owning your own domain name and using something like dyndns to bounce around
your DNS records quickly.  And a nice juicy open relay lets a spammer dodge
all sorts of restrictions.

Nick Walter

-----Original Message-----
From: David Walker [mailto:linux_user at grax.com]
Sent: Wednesday, May 08, 2002 2:51 PM
To: olug at olug.org
Subject: [olug] SPAM, Viruses, and forged mail headers


I came up with an idea, or at least the beginning of an idea, on how to stop
header forgery in email.  If this works it could keep spammers from using
domain names they do not have control of in their return addresses. (and
some
viruses that forge email headers would be stopped as well.)

I would appreciate some feedback on my ideas at
http://www.vorteon.com/papers/spam_reduction_through_dns.html



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