Just to let you guys know what has been happening so far.
I changed the entry in main.c from dbmail.conf to /usr/local/etc/dbmail.com (which is where it would normally lie in freebsd). Little did I know that imap C file had the value hardcoded as /etc/dbmail.conf. SO I changed main.c to /etc/dbmail.conf and recompiled. It might be a good idea to make that a configure option or at least defined in one place.
Also the install.sh and build.sh presume bash will be in /bin/bash on freebsd it's usually in /usr/local/bin/bash but I imagine there is nothing that can be done about that.
anyways it seems to work now (the imap part anyway I did not test the pop). I never did get it working with postgres though.
Next I am going to try to get it working with http://messagewall.org/ messagewall. It seems like they should go well together because messagewall can handle the anti spam features. We'll see.
