>> check_sender_access hash:/etc/postfix/sender_checks,
>
>That directive checks the email address which is used in the SMTP MAIL
>FROM command.
>
>I believe you need to use check_client_access to check the verified
>client hostname instead of check_sender_access.
>
>

Bill & Noel, thank you both for the assist.  

Moving my check from sender_checks to client_checks appears to have resolved my 
issue, I now see some RBL listed M$ host's mail making it past my RBL checks.  

Seems I always mix up client and sender, somewhere many years ago I got it 
stuck in my head postfix client checks was IP only.  Obviously incorrect.




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