add spam filter

confd/templates/setup_main.tmpl

@@ -57,3 +57,14 @@ postconf maillog_file=/dev/stdout
 {{ with getv "/message/size/limit" }}postconf message_size_limit='{{.}}'{{ end }}
 {{ with getv "/smtpd/helo/required" }}postconf smtpd_helo_required='{{.}}'{{ end }}
 {{ with getv "/biff" }}postconf biff='{{.}}'{{ end }}
+
+postconf -M spamfilter/unix | grep -q spamfilter || {
+    postconf -M spamfilter/unix="spamfilter unix - n n - - pipe"
+}
+postconf -F spamfilter/unix/private=- \
+         spamfilter/unix/unprivileged=n \
+         spamfilter/unix/chroot=n \
+         spamfilter/unix/wakeup=- \
+         spamfilter/unix/process_limit=- \
+         spamfilter/unix/command='pipe flags=Rq user=vmail argv=/usr/local/bin/spamfilter -oi -f ${sender} ${recipient}'
+postconf -P smtp/inet/content_filter=spamfilter