Exim filter for failed dkim or not in acceptable domain list

I wish to create an exim filter (newby here and afraid of touching exim file but will give it a try) which will apply the following rules in the following order: 1st check) If inbound message not on acceptable domain list dump message into bad-domain folder in user's Roundcube Webmail account. OR 2nd. check) If dkim failed dump message into dkim-failed folder in user's Roundcube Webmail folder. I see that I can use CPanel account level filtering, but there is no dictionary available that defines these different cases (values) - as well, the sketchy documentation does not state if it searches ALL headers for matches or just the basics like from, to, subject, etc. Thank you.