K, I searched through smiliar threads but they are not the same as the issue I have.
Setup: Zimbra Open Source Edition to replace a Windows 2003 po/smtp
Static IP, properly set RDNS, MX, DNS, SPF
Mxtoolbox.com - Good for diag, and not listed on any blacklist
dnsstuff.com - Domain Scan - Good no errors
But Yahoo, Hotmail, GMail all filter the email as junk. I looked at the headers and they really don't anything out of the normal. Anyone have any direction to look?