For SASL it seems to be easier to use Postfix together with dovecot.
See http://www.postfix.org/SASL_README.html and http://wiki.dovecot.org/HowTo/PostfixAndDovecotSASL
If the current setup is working I would not mess around with it anymore. You could try the Postfix - Dovecot combination on a second box and see whether that is easier to configure.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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