diff --git a/keyserver/src/push/send.js b/keyserver/src/push/send.js
--- a/keyserver/src/push/send.js
+++ b/keyserver/src/push/send.js
@@ -513,6 +513,11 @@
   if (copyWithMessageInfos.length() <= apnMaxNotificationPayloadByteSize) {
     notification.payload.messageInfos = messageInfos;
   }
+  if (notification.length() > apnMaxNotificationPayloadByteSize) {
+    console.warn(
+      'iOS notification exceeds size limit, even with messageInfos omitted',
+    );
+  }
   return notification;
 }
 
@@ -565,6 +570,15 @@
   ) {
     return copyWithMessageInfos;
   }
+
+  if (
+    Buffer.byteLength(JSON.stringify(notification)) >
+    fcmMaxNotificationPayloadByteSize
+  ) {
+    console.warn(
+      'Android notification exceeds size limit, even with messageInfos omitted',
+    );
+  }
   return notification;
 }