I use sendmail, and security/cyrus-sasl2 with sendmail, with the latter configured to use smtp-auth (a compile time environment variable set in /etc/mk.conf, used by /usr/src/gnu/usr.sbin/sendmail/sendmail/Makefile).
I've now actually pulled down a package of cyrus-sasl2 and looked inside. Please review the man page for saslauthd. It does not have a configuration file of its own ... however, it mentions, in the FILES section, a file /etc/saslauthd.conf -- and describes it as used for configuring ldap support. It is not included in the port. If you are not using ldap, you won't need it.
But, if you install the "ldap" FLAVOR of cyrus-sasl2, you'll find a sample configuration file in /usr/local/share/examples/sasl2/saslauthd.conf
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