Attempt at ARC/DKIM signing for mailman

abra.sh

@@ -1,3 +1,5 @@
 export CERTDUMPER_POST_VERSION=v1
 export POSTFIX_OVERRIDE_VERSION=v15
 export SENDER_LOGIN_VERSIONS=v2
+export ARC_OVERRIDE_VERSION=v8
+export DKIM_IP_MAP_OVERRIDE_VERSION=v2

compose.mailman.yml

@@ -16,6 +16,14 @@ services:
     configs:
       - source: postfix_override
         target: /overrides/postfix.cf
+  antispam:
+    configs:
+      - source: arc_conf_override
+        target: /overrides/arc.conf
+      - source: dkim_ip_map_override
+        target: /overrides/dkim_ip.map
+    volumes:
+      - "rspam_overrides:/etc/rspamd/override.d"
 
 networks:
   shared_mailman_network:
@@ -27,9 +35,17 @@ volumes:
   shared-mailman-core:
     external: true
     name: ${MAILMAN_CORE_VOLUME}
+  rspam_overrides:
 
 configs:
   postfix_override:
     name: ${STACK_NAME}_postfix_overrides_${POSTFIX_OVERRIDE_VERSION}
-    file: postfix.cf.tmpl
+    file: mailman-postfix.cf.tmpl
+    template_driver: golang
+  arc_conf_override:
+    name: ${STACK_NAME}_arc_conf_override_${ARC_OVERRIDE_VERSION}
+    file: mailman-arc.conf
+  dkim_ip_map_override:
+    name: ${STACK_NAME}_dkim_ip_map_${DKIM_IP_MAP_OVERRIDE_VERSION}
+    file: mailman-dkim_ip.map.tmpl
     template_driver: golang

logging.inc

@@ -0,0 +1,2 @@
+type=console
+debug_modules=dkim

mailman-arc.conf

@@ -0,0 +1,7 @@
+sign_networks = "/overrides/dkim_ip.map";
+path = "/dkim/$domain.$selector.key";
+use_domain = "header";
+#use_vault = false;
+#try_fallback = true;
+#selector_map = "/overrides/dkim_selectors.map";
+#selector = "dkim";

mailman-dkim_ip.map.tmpl

@@ -0,0 +1 @@
+{{ env "RELAYNETS" }}