"One of the greatest assets of the Haraka mail server is the
light weight and speed at which it functions. This important aspect
is carried over into how it works with major plugins like
Spamassassin. Spamassassin or similar tool is an absolute necessity
for any mail server. Using this plugin with Haraka eliminates the
typical need for an additional interface like Amavisd, just another
advantage for Haraka."