diff --git a/lib/reducers/user-reducer.js b/lib/reducers/user-reducer.js
--- a/lib/reducers/user-reducer.js
+++ b/lib/reducers/user-reducer.js
@@ -116,9 +116,13 @@
       return currentUserInfo;
     }
   } else if (
-    action.type === incrementalStateSyncActionType ||
-    action.type === processUpdatesActionType
+    (action.type === incrementalStateSyncActionType ||
+      action.type === processUpdatesActionType) &&
+    relyingOnAuthoritativeKeyserver
   ) {
+    if (action.payload.keyserverID !== authoritativeKeyserverID()) {
+      return state;
+    }
     return action.payload.updatesResult.newUpdates.reduce(
       (reducedState, update) => {
         const { reduceCurrentUser } = updateSpecs[update.type];
@@ -128,7 +132,13 @@
       },
       state,
     );
-  } else if (action.type === processServerRequestsActionType) {
+  } else if (
+    action.type === processServerRequestsActionType &&
+    relyingOnAuthoritativeKeyserver
+  ) {
+    if (action.payload.keyserverID !== authoritativeKeyserverID()) {
+      return state;
+    }
     const checkStateRequest = action.payload.serverRequests.find(
       candidate => candidate.type === serverRequestTypes.CHECK_STATE,
     );
@@ -371,9 +381,13 @@
       ];
     }
   } else if (
-    action.type === incrementalStateSyncActionType ||
-    action.type === processUpdatesActionType
+    (action.type === incrementalStateSyncActionType ||
+      action.type === processUpdatesActionType) &&
+    relyingOnAuthoritativeKeyserver
   ) {
+    if (action.payload.keyserverID !== authoritativeKeyserverID()) {
+      return [state, [], []];
+    }
     const newUserInfos = _keyBy(userInfo => userInfo.id)(
       action.payload.userInfos,
     );
@@ -412,7 +426,13 @@
         userStoreOps,
       ];
     }
-  } else if (action.type === processServerRequestsActionType) {
+  } else if (
+    action.type === processServerRequestsActionType &&
+    relyingOnAuthoritativeKeyserver
+  ) {
+    if (action.payload.keyserverID !== authoritativeKeyserverID()) {
+      return [state, [], []];
+    }
     const checkStateRequest = action.payload.serverRequests.find(
       candidate => candidate.type === serverRequestTypes.CHECK_STATE,
     );