Hi sm,
The startup parameters may be different. Verify what
"spamass_milter_flags" settings used in rc.conf to start the milter.
I'm in doubt we mean the same thing.
I verified these settings, an it's not spamass-milter not rewriting
headers -- but it does not write *all* headers. IIRC, the X-Spam-Level
should appear in each message, regardless of it's spam or not. But the
only header I see is X-Spam-Checker-Version. Subject rewriting would
be the next step in case of spam, but first of all it has to determine
the X-Spam-Level... and to write it to the header, doesn't it?
Regards,
Marianne