spamc - 3.4.2-1+deb10u3 main

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.
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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).