Use rspamd as a milter service instead of deprecated rmilter

services/rspamd/conf/local.d/milter_headers.conf

@@ -0,0 +1,11 @@
+authenticated_headers = ["authentication-results"];
+skip_local = false;
+skip_authenticated = false;
+
+use = ["x-spamd-bar", "x-spam-level", "x-virus", "authentication-results"];
+
+routines {
+  x-virus {
+    symbols = ["CLAM_VIRUS", "FPROT_VIRUS", "JUST_EICAR"];
+  }
+}