[TriLUG] postfix spam blocking

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On 12/16/11 6:29 PM, Amnon wrote:
> Guys, being in the ISP business now for 16 years (and not good with
> Linux at all :-) I see one way to REALY put a big dent in spam. We have
> systems that list bad IP's, bad emails, bed users etc.  but we don't
> have a system that lists and maintain a list of legitimate mail
> servers. 

http://en.wikipedia.org/wiki/DomainKeys_Identified_Mail

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