Spamc is the client to communicate with spamd, the daemonized form of SpamAssassin (see the spamassassin package). It is written in C for maximum speed and minimum loading overhead.

spamc is quite useful for integrating spamassassin into an MTA or into a .procmailrc file because of its speed.

This package is useless unless you have spamassassin installed, either on this machine or another local machine (i.e. a mail server).