The dovecot antispam plugin watches a defined spam folder (defaults to
"SPAM"). It works together with a spam system that classifies each message as
it is delivered. When the message is classified as spam, it shall be delivered
to the spam folder, otherwise via the regular filtering file the user may
have (maildrop, sieve, ...). Now the user has everything classified as spam in
the special spam folder, everything else where it should be sorted to.

Authors:
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Eugene Paskevich
Johannes Berg
Frank Cusack
Benedikt Boehm
Andreas Schneider