add spam filter

Dockerfile

@@ -60,6 +60,7 @@ RUN echo "_dev_null: /dev/null" > /etc/aliases \
 	libsasl2-modules \
 	ssl-cert \
 	ca-certificates \
+	bogofilter-sqlite \
   && rm -rf /var/lib/apt/lists/* \
   && cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf \
   && mkdir -p /etc/postfix/rules \
@@ -71,6 +72,8 @@ RUN echo "_dev_null: /dev/null" > /etc/aliases \
 	/etc/postfix/rules/postscreen_dnsbl_mask.pcre \
   && mkdir -p /ssl \
   && chmod 700 /ssl \
+  && groupadd -g 5000 vmail && useradd -g vmail -u 5000 vmail -d /vmail \
+  && mkdir -p /vmail/bogofilter && chown vmail:vmail /vmail
   && cp /etc/ssl/certs/ssl-cert-snakeoil.pem /ssl/cert.pem \
   && cp /etc/ssl/private/ssl-cert-snakeoil.key /ssl/key.pem \
   && postconf -F \
@@ -96,9 +99,9 @@ RUN echo "_dev_null: /dev/null" > /etc/aliases \
      scache/unix/chroot=n
 
 ADD confd /etc/confd/
-ADD postmap_all /usr/local/bin/
+ADD postmap_all spamfilter /usr/local/bin/
 
-VOLUME ["/etc/postfix","/ssl","/var/spool/postfix"]
+VOLUME ["/ssl","/var/spool/postfix"]
 EXPOSE 25/tcp 587/tcp
 
 CMD ["postfix","start-fg"]