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/usr/share/doc/spamc/README.Debian is in spamc 3.4.2-1~deb9u1.

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spamc has been separated from the spamassassin package to accommodate
people who wish to install spamd on a server, and just run spamc from
other computers.

Unless you are using spamc to connect to a spamd server on the local
network, it is strongly recommended that you install spamassassin.

Duncan Findlay
duncf@debian.org