I have some forwarding setup for people with sbcglobal.net email addresses. It appears DH is getting blocked by them now as well?! Can someone please confirm? Here is the error..
Diagnostic-Code: X-Postfix; host sbcmx1.prodigy.net[220.127.116.11] said: 553
5.3.0 flpi100,DNSBL:To request removal of, 18.104.22.168, send the
complete error message in an E-mail to firstname.lastname@example.org (in reply
to MAIL FROM command)