I'm an OpenBSD user, who set up SASL in order to use DynDNS mailhop forwarding. I use it with the built-in sendmail, though.
SASL is not used for the e-mail itself, as it might be forwarded in-the-clear if the destination MX does not support it. It does, however, restrict the use of your mailhop service, that you pay for, to you.
In order to build sendmail with SASL support on that OS, I needed two things:
1) The cyrus-sasl package had to be installed
2) Sendmail needed to be built with WANT_SMTPAUTH=yes (which went into /etc/mk.conf)
I don't know if NetBSD might also require cyrus-sasl.
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