I really want to try OpenSMTPD, but I need it to hook into my Dovecot backend for SMTP auth (SASL would be awesome), and it needs to work with in-line email fil

I really want to try OpenSMTPD, but I need it to hook into my Dovecot backend for SMTP auth (SASL would be awesome), and it needs to work with in-line email filtering (i.e. when a message is rejected as spam by amavisd I need that error to propagate back to the sending server). I haven't found good information on how to do any of that yet. Right now my pipeline is pretty simple: Postfix accepts -> milter (amavisd) -> dovecot for delivery I would want to replicate something similar. Do you have any good resources or information?