I've followed the instructions in the how-to for installing dkfilter (including putting part 4 in the master.cf and not main.cf). Should there be anything in postfix' main.cf? Additionally, the startup script seems to hang after starting up the inbound filter, before starting up the outbound filter. Also, how do I know if it's even working? I don't seem to note any indications, and I don't see any place where we'd be logging.