spampd - 2.53-1.2 main

spampd is an SMTP/LMTP server designed to be hooked into the
MTA processing chain (e.g. as a content filter). It is
written in Perl and uses the Net::Server framework. It is
intended to provide spam filtering at the system level (i.e.
ususally for all users). If you rely on per-user configuration
or per-user Bayes databases, spampd is not for you.
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The major advantage of spampd over plain SpamAssassin (both
directly and through spamd) is that it doesn't need to load
all needed perl modules on every invocation or spawn
a C programme for every mail it receives. Compared to using
spamc/spamd, spampd can usually provide a 25% performance
increase with local-only tests.
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The advantage of spampd over amavisd-new is that it uses the
original SpamAssassin header tags, which are more verbose than
the tags which amavisd-new provides. This allows easier
filtering in the mail client and easier tuning of SpamAssassin.