<header>SpamAssassin client program</header>

This option determines if spam filtering is done using the standalone
<tt>spamassassin</tt> program, or the <tt>spamc</tt> lightweight client.
In the latter case, your system must be running the <tt>spamd</tt> server,
or no spam classification will be done. <p>

Using <tt>spamc</tt> is typically faster and consumes less CPU.  However, it will take away the ability to
have a different SpamAssassin configuration for each virtual server, as the <tt>spamd</tt> server can
only read a single set of configuration files. Using <tt>spamc/spamd</tt> also consumes more memory.<p>

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