Abook is a text-based addressbook program designed to use with mutt mail client.

Amavisd-new is a high-performance interface between mailer (MTA) and content checkers: virus scanners or SpamAssassin. It talks to the MTA via (E)SMTP, LMTP.

automx makes setting up a mail account easy. All your users need to provide is
real name, mail address and password. Their mail client and automx will safely
handle the rest.

automx runs on your server and handles mail account profile requests from your
mail clients. Put an end to endless phone calls trying to coach users to
configure settings, whose dialogs they can't find. Stop waisting your time
writing Tutorials nobody reads.

automx unifies Microsofts and Mozillas mail account provisioning standards in
one powerful Open Source tool. Choose from many backends, including LDAP and
SQL, and let automx create standard and individualized profiles for multiple
domains on the fly!

Rspamd is an advanced spam filtering system that allows evaluation of messages
by a number of rules including regular expressions, statistical analysis and
custom services such as URL black lists. Each message is analysed by rspamd and
given a `spam score`.

According to this spam score and the user's settings rspamd recommends an
action for the MTA to apply to the message- for example to pass, reject or add
a header. Rspamd is designed to process hundreds of messages per second
simultaneously and has a number of features available.

The goal of 'wforced' is to detect brute forcing of passwords across many
servers, services and instances. In order to support the real world, brute
force detection policy can be tailored to deal with "bulk, but legitimate"
users of your service, as well as botnet-wide slowscans of passwords.

The aim is to support the largest of installations, providing services to
hundreds of millions of users. The current version of weakforced is not quit
there yet.

System an network monitoring software.

Munin is a highly flexible and powerful solution used to create graphs of
virtually everything imaginable throughout your network, while still
maintaining a rattling ease of installation and configuration.

This package contains the grapher/gatherer. You will only need one instance of
it in your network. It will periodically poll all the nodes in your network
it's aware of for data, which it in turn will use to create graphs and HTML
pages, suitable for viewing with your graphical web browser of choice.

Munin is written in Perl, and relies heavily on Tobi Oetiker's excellent
RRDtool.