This is a simple autoresponder for qmail. Mail is sent to help@my-company.com. An automatically generated response is sent back to the user with an address of "help@my-company.com". You can set the envelope sender to an empty string. However, some programs will parse the message for the "From:" field and send an autoresponse back to it. It is received at your autoresponder, and you now have a mail loop. This autoresponder also catches some other simple situations such as mail from a mailer-daemon, empty envelope sender, bulk precedence headers, etc.
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.