diff --git a/local.d/multimap.conf b/local.d/multimap.conf
index dedd5a0..71c0f5f 100644
--- a/local.d/multimap.conf
+++ b/local.d/multimap.conf
@@ -1,3 +1,11 @@
+KNOWN_SPAM_STRING {
+    type = "content";
+    filter = "full";
+    map = "${LOCAL_CONFDIR}/maps/known_spam.map";
+    prefilter = true;
+    action = "reject";
+    regexp = true;
+}
 
 # Envelope From in high-spammy-tlds.txt
 high_spammy_tlds_envfrom {