This little number can be used to introduce smtp banner delays for qmail. When run between tcpserver and rblsmtpd, it'll do a reverse lookup of the connecting IP, compare that PTR to a regex, and then apply long banner delays if there was no PTR or if the PTR matches the "dialup" regex. The program depends on the fact that tcpserver will set TCPREMOTEIP, and will take advantage of TCPREMOTEHOST if it's set. If the client tries to pipeline (ram SMTP commands down our throat before we show them an SMTP banner), RBLSMTPD is set, notifying rblsmtpd to refuse their mail.
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.