From: Alexander Grüner (agruenergmx.de)
Date: Fri Aug 18 2006 - 01:09:45 CDT

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Hello :-)

Domain Kiting (http://en.wikipedia.org/wiki/Domain_kiting) is used to
register domain names for purposes like ads or spam (which is my point
here, of course).

My idea would be to block mails from domains which are not older than 5
days to prevent spamming from these sites. Normally there will be no
false positives at all.

I could even think about some kind of ranking, depending how long this
domain already exists. For example something like ibm.com is from this
point of view much more trustworthy than a new domain which is since 2
weeks on the market. I hope you understand what I mean...

Does anybody see a possibilty how this could be done in postfix ? Of
course not "out of the box" ;-)

I am using reject_unknown_sender_domain already.

Regards,
Alexander

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