If an application calls SASL utilities, you install security/cyrus-sasl2. For 4.9-release, the base package is cyrus-sasl-2.1.23p5, and there are various FLAVORs for integration with various database technologies.
Postfix can use SASL libraries, but as I don't use Postfix, I don't know if that is in addition to, or instead of, the SASL utilities. I know this only because there is a sasl2 FLAVOR for postfix that was built with security/libgsasl as a dependency in both "stable" and "snapshot" versions of Postfix. Pick the one you want, and re-install that particular FLAVOR of Postfix. The package will install the appropriate libgsasl package as a dependency.
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