diff --git a/lib/reducers/dm-operations-queue-reducer.js b/lib/reducers/dm-operations-queue-reducer.js
new file mode 100644
--- /dev/null
+++ b/lib/reducers/dm-operations-queue-reducer.js
@@ -0,0 +1,26 @@
+// @flow
+
+import {
+  type QueuedDMOperations,
+  queueDMOpsActionType,
+} from '../types/dm-ops.js';
+import type { BaseAction } from '../types/redux-types.js';
+
+function reduceDMOperationsQueue(
+  store: QueuedDMOperations,
+  action: BaseAction,
+): QueuedDMOperations {
+  if (action.type === queueDMOpsActionType) {
+    const { threadID, operation } = action.payload;
+    return {
+      ...store,
+      operations: {
+        ...store.operations,
+        [threadID]: [...(store.operations[threadID] ?? []), operation],
+      },
+    };
+  }
+  return store;
+}
+
+export { reduceDMOperationsQueue };
diff --git a/lib/reducers/master-reducer.js b/lib/reducers/master-reducer.js
--- a/lib/reducers/master-reducer.js
+++ b/lib/reducers/master-reducer.js
@@ -7,6 +7,7 @@
 import reduceCustomerServer from './custom-server-reducer.js';
 import reduceDataLoaded from './data-loaded-reducer.js';
 import { reduceDBOpsStore } from './db-ops-reducer.js';
+import { reduceDMOperationsQueue } from './dm-operations-queue-reducer.js';
 import { reduceDraftStore } from './draft-reducer.js';
 import reduceEnabledApps from './enabled-apps-reducer.js';
 import { reduceEntryInfos } from './entry-reducer.js';
@@ -226,6 +227,10 @@
         state.tunnelbrokerDeviceToken,
         action,
       ),
+      queuedDMOperations: reduceDMOperationsQueue(
+        state.queuedDMOperations,
+        action,
+      ),
     },
     storeOperations: {
       draftStoreOperations,
diff --git a/lib/shared/dm-ops/process-dm-ops.js b/lib/shared/dm-ops/process-dm-ops.js
--- a/lib/shared/dm-ops/process-dm-ops.js
+++ b/lib/shared/dm-ops/process-dm-ops.js
@@ -8,6 +8,7 @@
 import {
   type DMOperation,
   processDMOpsActionType,
+  queueDMOpsActionType,
 } from '../../types/dm-ops.js';
 import { useDispatch, useSelector } from '../../utils/redux-utils.js';
 
@@ -38,7 +39,15 @@
         utilities,
       );
       if (!processingCheckResult.isProcessingPossible) {
-        // TODO queue for later
+        if (processingCheckResult.reason === 'missing_thread') {
+          dispatch({
+            type: queueDMOpsActionType,
+            payload: {
+              operation: dmOp,
+              threadID: processingCheckResult.reason.threadID,
+            },
+          });
+        }
         return;
       }
       const { rawMessageInfos, updateInfos } = await dmOpSpecs[
diff --git a/lib/types/dm-ops.js b/lib/types/dm-ops.js
--- a/lib/types/dm-ops.js
+++ b/lib/types/dm-ops.js
@@ -297,6 +297,12 @@
   +updateInfos: $ReadOnlyArray<ClientUpdateInfo>,
 };
 
+export const queueDMOpsActionType = 'QUEUE_DM_OPS';
+export type QueueDMOpsPayload = {
+  +operation: DMOperation,
+  +threadID: string,
+};
+
 export const scheduleP2PMessagesActionType = 'SCHEDULE_P2P_MESSAGES';
 export type ScheduleP2PMessagesPayload = {
   +dmOpID: string,
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -44,6 +44,7 @@
   ScheduleP2PMessagesPayload,
   ProcessDMOpsPayload,
   QueuedDMOperations,
+  QueueDMOpsPayload,
 } from './dm-ops.js';
 import type { DraftStore } from './draft-types.js';
 import type { EnabledApps, SupportedApps } from './enabled-apps.js';
@@ -1572,7 +1573,8 @@
         +type: 'PROCESS_DM_OPS',
         +payload: ProcessDMOpsPayload,
       }
-    | { +type: 'SCHEDULE_P2P_MESSAGES', +payload: ScheduleP2PMessagesPayload },
+    | { +type: 'SCHEDULE_P2P_MESSAGES', +payload: ScheduleP2PMessagesPayload }
+    | { +type: 'QUEUE_DM_OPS', +payload: QueueDMOpsPayload },
 }>;
 
 export type ActionPayload = ?(Object | Array<*> | $ReadOnlyArray<*> | string);