I know it is possible to use RBLs and wordlist filtering with Exim but can't seem to find any examples. The closest thing I've found so far is http://www.sput.nl/software/exim.html which is more massive then I would hope for.
I have DKIM configured in Exim for outgoing mail, as per the documentation. Exim signs all outgoing mail. But some of that outgoing mail is forwarded, thanks to a users .forward file. This is a problem for me, because some of those messages are spam (my exim configuration does not do any verification) and I don't want to take responsibility for them.
I have a server running cPanel/WHM with exim and SpamAssassin. I've been noticing an issue where emails coming in with forged spamassassin headers bypassing some of the filtering. I want to strip out all SpamAssassin headers before it goes through spamassassin and then filtered into the inbox/spam folders.
Searching the net, the only similar instance I could find was from 2004.
I've tried a couple of different methods of accomplishing this but haven't found one that works the way I want. I have an external spam filter that I'm forwarding into cPanel. It marks all detected messages by prepending ***SPAM*** to the subject line.