Postfix "header_checks" is insane for me to accomplish [duplicate]
The correct solution to my post lies here: -o receive_override_options=no_header_body_checks
I just added the line -o receive_override_options=no_header_body_checks to my master.cf file without a comment and voilá. So far I have being doing what I wanted to in the beginning. I guess this entire post should be deleted or marked as duplicated.