qmail-rblchk filters all incoming mail and check if it comes
from RBL listed IPs. It is for use in .qmail to check the IP
address from the Received lines. It has the same function as
rblsmtpd, but the messages are checked at local delivery time.
This program sends zone change notify messages from
djbdns master to BIND DNS slave servers.
tinystats is a filter that reads tinydns logs and
stores statistics about query types and errors in
your authoritative DNS server.
A tool for securing DNS communications between a client and a DNS resolver.
A polyhedral extraction tool (PET).