traditionally, our (pre-PMG) exim4-mailserver has used spamassassin's `$spam_bar` to indicate the spam-level with `+` signs, e.g. Code: X-Spam-Score: +++++++ now PMG uses `__SPAM_STARS__` instead, which is similar in concept, but uses a different characters (`*` instead of `+`), e.g. Code: X-Spam-Score: ******** . In order to not break any filte-rules of my users, I would like to report the score in my old format (with `+`). How would I do that? Can I tell PMG to report the spam-score with `+/-` characters, or do I have to do a header-rewrite on my mail-server's side?