# Pastebin WkxjHIm8
# grep auto /etc/postfix/main.cf ; cat /etc/postfix/bulk-header /etc/postfix/autosubmitted-header
header_checks = pipemap:{regexp:/etc/postfix/bulk-header, regexp:/etc/postfix/autosubmitted-header}
/^From: .* <(admin|noreply)@.*>/i PREPEND Precedence: bulk
/^From: .* <(admin|noreply)@.*>/i PREPEND Auto-Submitted: auto-generated