SpamAssassin disabled for Amavis on Debian/testing
I'm building an environment with Postfix, Amavis and SpamAssassin on
Debian/testing. Everything seems to do fine and Postfix is using Amavis on
Unfortunately Amavis is not using SpamAssassin as there are no headers from
SpamAssassin in incoming mails.
I've asked for help on the Amavis mailing list  and got told that this
could be Debian specific as SpamAssassin is enabled by default.
I've checked /etc/amavis/conf.d/15-content_filter_mode and everything is
commented out so I expect SpamAssassin to work.
Where can I look to enable SpamAssassin with Amavis on Debian?