try fixing antispam learning

Dockerfile

@@ -47,7 +47,7 @@ RUN groupadd -g 5000 vmail && useradd -g vmail -u 5000 vmail -d /vmail \
      dovecot-submissiond \
      dovecot-managesieved \
      dovecot-antispam \
-     bogofilter \
+     bogofilter-sqlite \
      ssl-cert \
      ca-certificates \
   && rm -rf /var/lib/apt/lists/* \
@@ -69,9 +69,11 @@ ADD junk-filter.sieve /etc/dovecot/sieve/before/
 
 ADD confd /etc/confd/
 
+ADD mailtrain /usr/local/bin/
+
 RUN sievec /etc/dovecot/sieve/before
 
-VOLUME /etc/dovecot /ssl /vmail
+VOLUME /ssl /vmail
 
 EXPOSE 110/tcp 143/tcp 587/tcp 993/tcp 995/tcp 2000/tcp