Milter-greylist

Christian PELISSIER wrote:
> Le mar. 23/09/2008 \ufffd 09:22, Brian W. Antoine a \ufffdcrit :
> 
>>   And the fact that gmail/yahoo signs their messages proves what?
> 
> Just that mail comes from gmail. DKIM is another way to skip
> greylisting, same as SPF or DNSWL, stronger than SPF and just depending
> from the DNS DKIM public-key record of the sender domain.
> It can also be used to score (adding headers) message.

  Checking that signature also places a higher load on your mail
server, whitelisting their server ranges is a better solution.