header MAILER_ACCUCAST ALL =~ /^Accucast\b/i describe MAILER_ACCUCAST Uses Spam Mailer Accucast score MAILER_ACCUCAST 2.0
But it does not work.
When you do "ALL" as the header specifier, the header names become a part of the lines.. Therefore your ^ is screwing up your rule because the "line" doesn't start with Accucast.. it starts with X-Mailer.
I'd suggest doing something like this instead:
header MAILER_ACCUCAST ALL =~ /\:\sAccucast\b/i
However, why not just do an x-mailer only rule?
header MAILER_ACCUCAST_XMAIL X-Mailer =~ /Accucast\b/i
