Don't set NOT_SENT in the scheduler; the MatrixClient is responsible for this.

lib/scheduler.js

@@ -174,8 +174,6 @@ function _processQueue(scheduler, queueName) {
             debuglog(
                 "Queue '%s' giving up on event %s", queueName, obj.event.getId()
             );
-            // mark event as not sent
-            obj.event.status = EventStatus.NOT_SENT;
             // remove this from the queue
             _removeNextEvent(scheduler, queueName);
             obj.defer.reject(err);