I used this howto to setup my domainkeys: http://www.howtoforge.com/how-to-implement-domainkeys-in-postfix-using-dk-milter-centos5.1 Everything "works" - emails are signed as they are sent out, an automated domainkey checker validates the key (send an email to [email protected] and it will automatically respond), here's the response I receive (original email is included): When I send an email to yahoo (from the same account on the same server using the same send method), it ends up in the spam folder and has these headers: Where can I start on trying to fix this problem? Thanks!