IMAPAssassin

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Well, right now we're using SpamAssassin as a library. So
the perl interpreter is started once when you start
IMAPAssassin. So this is probably even faster than
spamc/spamd. ;-)

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as far as I read in the documentation for spamc/spamd -
spamd is faster because it doesn't start an individual perl
interpreter process for every spamassassin call.

since imapassassin uses the spamassassin classes directly
no additional perl interpreter is started.

As long as you don't run multiple imapassassin processes
parallel it shouldn't give you much speedup.

if you do and you would use spamd you'd still have the
multiple interpreter problem. so it would be better to use
threads or preforking in imapassassin.