Add rspamd as a second spam filter alongside SpamAssassin

Closes: #36

docker/entrypoint.sh

@@ -15,6 +15,10 @@ mkdir -p /var/spool/postfix/authentication_milter
 chown mail:mail /var/spool/postfix/authentication_milter
 chmod 750 /var/spool/postfix/authentication_milter
 
+mkdir -p /var/spool/postfix/rspamd
+chown rspamd:mail /var/spool/postfix/rspamd
+chmod 750 /var/spool/postfix/rspamd
+
 # Create log directory
 mkdir -p /var/log/happydeliver /var/cache/authentication_milter /var/spool/authentication_milter /var/lib/authentication_milter /run/authentication_milter
 chown happydeliver:happydeliver /var/log/happydeliver

docker/postfix/main.cf

@@ -28,7 +28,7 @@ transport_maps = pcre:/etc/postfix/transport_maps
 # OpenDKIM for DKIM verification
 milter_default_action = accept
 milter_protocol = 6
-smtpd_milters = unix:/var/spool/postfix/authentication_milter/authentication_milter.sock unix:/var/spool/postfix/spamassassin/spamass-milter.sock
+smtpd_milters = unix:/var/spool/postfix/authentication_milter/authentication_milter.sock unix:/var/spool/postfix/spamassassin/spamass-milter.sock unix:/var/spool/postfix/rspamd/rspamd-milter.sock
 non_smtpd_milters = $smtpd_milters
 
 # SPF policy checking

docker/rspamd/local.d/actions.conf

@@ -0,0 +1,5 @@
+no_action = 0;
+reject = null;
+add_header = null;
+rewrite_subject = null;
+greylist = null;

docker/rspamd/local.d/milter_headers.conf

@@ -0,0 +1,5 @@
+# Add "extended Rspamd headers"
+extended_spam_headers = true;
+
+skip_local = false;
+skip_authenticated = false;

docker/rspamd/local.d/options.inc

@@ -0,0 +1,3 @@
+# rspamd options for happyDeliver
+# Disable Bayes learning to keep the setup stateless
+use_redis = false;

docker/rspamd/local.d/worker-proxy.inc

@@ -0,0 +1,6 @@
+# Enable rspamd milter proxy worker via Unix socket for Postfix integration
+bind_socket = "/var/spool/postfix/rspamd/rspamd-milter.sock mode=0660 owner=rspamd group=mail";
+upstream "local" {
+  default = yes;
+  self_scan = yes;
+}

docker/supervisor/supervisord.conf

@@ -33,6 +33,16 @@ stderr_logfile=/var/log/happydeliver/authentication_milter.log
 user=mail
 group=mail
 
+# rspamd spam filter
+[program:rspamd]
+command=/usr/bin/rspamd -f -u rspamd -g mail
+autostart=true
+autorestart=true
+priority=11
+stdout_logfile=/var/log/happydeliver/rspamd.log
+stderr_logfile=/var/log/happydeliver/rspamd_error.log
+user=root
+
 # SpamAssassin daemon
 [program:spamd]
 command=/usr/sbin/spamd --max-children 5 --helper-home-dir /var/lib/spamassassin --syslog stderr --pidfile /var/run/spamd.pid