Add global email delivery spam processing.

states/email/dovecot.sls

@@ -18,7 +18,20 @@ dovecot_conf:
     - mode: 0644
     - names:
       - /etc/dovecot/local.conf:
-        - source: salt://email/dovecot_local.conf
+        - source: salt://email/dovecot/dovecot_local.conf
+
+sieve_conf:
+  file.recurse:
+    - name: /var/lib/dovecot/sieve-before.d
+    - dir_mode: '0755'
+    - file_mode: '0644'
+    - source: salt://email/dovecot/sieve-before.d
+
+sieve_conf_compile:
+  cmd.run:
+    - name: for i in /var/lib/dovecot/sieve-before.d/*.sieve; do sievec $i; done
+    - onchanges:
+      - file: sieve_conf
 
 dovecot_service:
   service.running:

states/email/dovecot/dovecot_local.conf

@@ -25,3 +25,8 @@ service auth {
     group = Debian-exim
   }
 }
+
+# Sieve. Enable global spam handling.
+plugin {
+    sieve_before = /var/lib/dovecot/sieve-before.d/
+}

states/email/dovecot/sieve-before.d/01-spam.sieve

@@ -0,0 +1,13 @@
+require ["fileinfo"]
+
+# Handle rspamd output
+if header :contains "X-Spam-Status" "Yes"
+{
+        fileinto :create "Spam";
+        stop;
+}
+if exists ["X-Spam-Bar"]
+{
+        fileinto :create "Spam.ToClassify";
+        stop;
+}