This would be of very limited use. Most 'sender' address used in spam
are random made up addresses used one time only. Sometimes they even
use a different random sender for each recipient. The email address of
the sender of a message is of almost no use in detecting spam.
On Mon, 14 Aug 2000, Brian K. West wrote:
> Ok here is what I want to see.. I want exim to have a feature that
> will take the envelope sender... MD5 encrypt it and compair it
> against a DNS server such as what MAPS/DUL/RSS but with md5 hases.
> Example:
>
> Adding zinkmet@???
> dc32ab79148f69773e82fc98c83b555b
> Adding zlite.com
> 26d59a5353b0e30848f0233e7749b6e4
> Adding zone76@???
> 66bcd5967d3c6e0b71d32a666f8b36a2
>
>
> Those are examples... So when exim does a lookup against the
> specified DNS server it would do somthing like so:
>
> take zone76@??? MD5 encrypt it to 66bcd5967d3c6e0b71d32a666f8b36a2
>
> then perform this query:
> nslookup 66bcd5967d3c6e0b71d32a666f8b36a2.domain.com (similar to
> what maps does) this would give everyone a tool to help stop spam..
> now if you know of someplace or that does this with the senders
> address then please let me know.. I am sick of getting spam.. even
> with useing maps/rbl/dul I still get the stuff... MAPS/RBL/DUL use
> sender hostnames which can change at a drop of a hat. I want to
> take this approach to futher eliminated UCE... anyone with me?
>
> Later,
> Brian
