Email using domainkeys and spf

[Steve Meyers]

Andy Bradford wrote:
> Thus said Gabriel Gunderson on Fri, 30 Sep 2005 17:11:18 MDT:
>>Do you all find that you need  to set up your mail servers using these
>>two (domainkeys and spf) methods for verifying non-spam?
> 
> No. Neither of them will really  block that much spam. SPF may currently
> help you block more spam than DomainKeys though.

They're not meant to block spam.  They're meant to authenticate where 
the email came from.

Basically, DK and SPF make whitelisting domains feasible.  If you know 
that AOL actively keeps their users from spamming, and AOL publishes 
SPF/DK records, then you can whitelist all email from AOL.  Assuming it 
passes the SPF/DK test, that is.