SMS::Send is intended to provide a driver-based single API for sending SMS and MMS messages. The intent is to provide a single API against which to write the code to send an SMS message. At the same time, the intent is to remove the limits of some of the previous attempts at this sort of API, like "must be free internet-based SMS services". SMS::Send drivers are installed seperately, and might use the web, email or physical SMS hardware. It could be a free or paid. The details shouldn't matter. You should not have to care how it is actually sent, only that it has been sent (although some drivers may not be able to provide certainty).
Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.