SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free.
Nagios Monitoring
Credits
Various bits of code, scripts, and procedures were put together with information from John Simpson's qmail.jms1.net website. It's an excellent resource on managing and setting up a Qmail server.
Nagios has many useful plugins for monitoring this qmail server.
Prerequisites for Monitoring With Nagios
These instructions assume that you have a Nagios server already set up similar to the instructions on this site.
In order to check services that are local to the mail server, NRPE must be installed on the server, along with any check plugins that you want to use. Instructions for installing NRPE and the standard Nagios check plugins can be found here.
- check_qmailq - monitor the number of messages in your queue
- check_daemontools_service - monitor the status of daemontools services
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