--- a/src/dnsbl.cpp	Wed Feb 08 11:40:44 2017 -0800
+++ b/src/dnsbl.cpp	Sat Feb 18 15:06:32 2017 -0800
@@ -720,6 +720,16 @@
     return rs;
 }
 
+const char *mlfiPriv::check_uribl_signers() {
+    const char *st;
+    if (uribl_suffix) {
+        for (string_set::iterator s=dkim_signers.begin(); s!=dkim_signers.end(); s++) {
+            if (check_uribl(*this, hosts_uribl, *s, host_uribl)) return host_uribl;
+        }
+    }
+    return NULL;
+}
+
 void mlfiPriv::need_content_filter(CONTEXT &con) {
     if (!memory) {
         // first recipient that needs content filtering sets
@@ -1628,6 +1638,8 @@
         string_set whites;
         bool random = false;
         int  limit  = 0;
+        const char   *signer = NULL;
+        bool checked_signers = false;
         if (priv.dkim_signers.empty()) {
             snprintf(buf, sizeof(buf), "acceptable content from %s signer *",
                 (priv.fromaddr) ? priv.fromaddr : token_asterisk);
@@ -1653,10 +1665,27 @@
                 smfi_delrcpt(ctx, (char*)rcpt);
             }
             else if (st == token_unknown) {
+                if (!checked_signers) {
+                    signer = priv.check_uribl_signers();
+                    checked_signers = true;
+                    if (signer) {
+                        snprintf(buf, sizeof(buf), "dkim signer %s on uribl", signer);
+                        my_syslog(&priv, buf);
+                        snprintf(buf, sizeof(buf), "Mail rejected - dkim signed by %s", signer);
+                        msg = string(buf);
+                    }
+                }
+                if (signer) {
+                    // dkim signer is on the uribl
+                    smfi_delrcpt(ctx, (char*)rcpt);
+                }
+                else {
+                    // still unknown
                 unknowns.insert(rcpt);
                 random |= con.get_host_random();
                 limit   = max(limit, con.get_host_limit());
             }
+            }
             else if (st == token_white) {
                 whites.insert(rcpt);
             }