Tcpblocker is for sites that want to limit the
number of times an IP address can connect to a
tcpserver controlled service like SMTP within a
time period. Each time tcpblock runs, it counts
how many connections were made per client IP. If
an IP exceeds the configurable maximum number of
connections within the configurable time period,
then tcpblock outputs a standard deny line that
can be used to build a tcp.smtp style file.
Combined with a cron job and a run script,
tcpblocker can be configured to fit into just
about any qmail or tcpserver installation.
