diff --git a/lib/handlers/non-keyserver-activity-handler.js b/lib/handlers/non-keyserver-activity-handler.js
--- a/lib/handlers/non-keyserver-activity-handler.js
+++ b/lib/handlers/non-keyserver-activity-handler.js
@@ -78,8 +78,6 @@
       !viewerID ||
       !activeThread ||
       !activeThreadInfo ||
-      !threadSpecs[activeThreadInfo.type].protocol()
-        .threadActivityUpdatedByActivityHandlerOnly ||
       threadIsPending(activeThread)
     ) {
       return;