Re: Sendmail: How does one blacklist annoying spammers?

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On 06/28/2010 05:05 AM, Alan Cox wrote:
>> I believe that's what SPF is supposed to solve.  Sites advertise in
>> their DNS records which the "official" outgoing email servers are. 
> 
> Spammers advertise SPF records of 'the whole internet' (normally split
> into chunks to confuse checkers) and turning on SPF checking naïvely
> simply helps the spam get through.
> 
> SPF also breaks forwarding in many cases and has other problems
> including mailing list interactions.
> 
> The lack of massive uptake is not I suspect chance..
> 
> Alan
> 

   Agreed - SPF is not brilliant. DKIM makes more sense to me.

  gene
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