Milter-greylist

Or, can it even be done?

I have a header like so in the email:

Authentication-Results: some.domain.name;
	dkim=none (no signature); dkim-adsp=none

I would want to match on the Authentication-Results header which has a dkim=none in it. Using a dacl header regular expression.

Not sure if this is possible in the milter-greylist implementation.