On 2003.08.26, Chris Davies <[EMAIL PROTECTED]> wrote:The only problem here is that most of the cable modems out there have valid reverse addresses, and providers don't block outbound port 25 connections allowing spam to flow freely from cable modems that have valid reverse lookups.
I've been thinking this might be a good way to stop mail header forgeries (which most spam falls into the category of) but would annoy a lot of people ...
You might want to have a look at SPF, DHVP, RMX and DRIP all various proposals for doing things similar to what you're talking about.
A selection of links: <http://spf.pobox.com/> <http://216.239.33.104/search?q=cache:NSs- Ic8arhQJ:aspn.activestate.com/ASPN/Mail/Message/SPAM-L/ 1760122+dhvp+spam&hl=en&ie=UTF-8> <https://www1.ietf.org/mail-archive/working-groups/asrg/current/ maillist.html> <http://www.ietf.org/internet-drafts/draft-brand-drip-01.txt>
Matthew
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