diff --git a/lib/Qpsmtpd.pm b/lib/Qpsmtpd.pm
index a17f242..f77c251 100644
--- a/lib/Qpsmtpd.pm
+++ b/lib/Qpsmtpd.pm
@@ -302,6 +302,10 @@ sub run_continuation {
             $self->log(LOGERROR, $log_msg . "undef!");
             next;
         }
+        if ( !return_code($r[0]) ) {
+            $self->log(LOGERROR, $log_msg . $r[0]);
+            next;
+        }
 
         if ($tran) {
             my $tnotes = $tran->notes($name);
diff --git a/t/qpsmtpd.t b/t/qpsmtpd.t
index 4c81d8c..982bb67 100644
--- a/t/qpsmtpd.t
+++ b/t/qpsmtpd.t
@@ -149,12 +149,13 @@ sub __run_continuation {
             descr => 'DECLINED -> DENY',
         },
         # TODO: ignore invalid return codes rather than treating them like OK
-        #{
-        #    hooks => [ [123456,undef], [DENY, 'goaway'] ],
-        #    expected_response => '550/goaway',
-        #    disconnected => 0,
-        #    descr => 'INVALID -> DENY',
-        #},
+        {
+            hooks => [ [123456,undef], [DENY, 'goaway'] ],
+            expected_response => '550/goaway',
+            disconnected => 0,
+            logged => 'LOGERROR:Plugin ___FakeHook___, hook helo returned 123456',
+            descr => 'INVALID -> DENY',
+        },
         {
             hooks => [ sub { die "dead\n" }, [DENY, 'begone'] ],
             expected_response => '550/begone',