diff --git a/lib/filter-handler.js b/lib/filter-handler.js
index 2aff4ebd..7ae859d0 100644
--- a/lib/filter-handler.js
+++ b/lib/filter-handler.js
@@ -329,7 +329,11 @@ class FilterHandler {
                         let forwardMessage = done => {
                             if (userData.forward && !filterActions.get('delete')) {
                                 // forward to default recipient only if the message is not deleted
-                                forwardTargets.set(userData.forward, { type: 'mail', value: userData.forward });
+                                (Array.isArray(userData.forward) ? userData.forward : [].concat(userData.forward || [])).forEach(forward => {
+                                    if (forward) {
+                                        forwardTargets.set(forward, { type: 'mail', value: forward });
+                                    }
+                                });
                             }
 
                             if (userData.targetUrl && !filterActions.get('delete')) {