You might want to show some logs or other evidence if you want people to help you.
Ralph
You need logs to say you use DKIM/domain keys on your servers and how you did it, rpm or compile?
Well, if it will help you tell me on your experience with DKIM I am up for it!
YAHOO HEADERS
Return-Path: bob@bobhoffman.com
Authentication-Results: mta108.mail.re1.yahoo.com from=bobhoffman.com; domainkeys=neutral (no sig)
Received: from 72.35.68.59 (EHLO mail.bobhoffman.com) (72.35.68.59) by mta108.mail.re1.yahoo.com with SMTP; Wed, 24 Sep 2008 09:28:44 -0700
Received: from obiwan2 ([98.64.115.101]) (authenticated bits=0) by mail.creativeprogramdesigners.com (8.13.8/8.13.8) with ESMTP id m8OGSCwJ014172 for testaccount@yahoo.com; Wed, 24 Sep 2008 12:28:12 -0400
From: "Bob Hoffman" bob@bobhoffman.com
This is a virtualhost account, sent via smtp from my home, through the server. The mail.creativ...com is the hostname of the server.
When sending from a php application, all the info is about the same, however the 'received from' obviously says apache@mail.creat...com and the ip address of the server is listed instead of the website.
It is my contention that DKIM will tip it for yahoo, but not sure it is worth the work. As well as spf.