diff --git a/imports/modules/server/notificationsProcess.js b/imports/modules/server/notificationsProcess.js
index e78f426..657aa2a 100644
--- a/imports/modules/server/notificationsProcess.js
+++ b/imports/modules/server/notificationsProcess.js
@@ -43,7 +43,18 @@ function imgUrl(lat, lng) {
    return `<img src="${imgUrl(lat, lng)}" width="640" height="480"/>`;
    } */
 
+// Cutover flag (fase 1a): channels listed in
+// Meteor.settings.private.notifDisabledChannels (e.g. ['mobile','web']) are
+// handled by the tcef-notifications microservice, so the old observer/cron must
+// NOT send them. Mutual exclusion per channel — reversible by editing settings,
+// no code deploy needed. ES5-compatible on purpose (Meteor 1.6 / Node 8).
+const notifDisabledChannels = (Meteor.settings.private && Meteor.settings.private.notifDisabledChannels) || [];
+
 const processNotif = (notif) => {
+  if (notifDisabledChannels.indexOf(notif.type) !== -1) {
+    // This channel was migrated to tcef-notifications; do nothing here.
+    return;
+  }
   if (isMailServerMaster && validFcmSender && notif.type === 'mobile' && notif.notified !== true) {
     const fcmSender = new gcm.Sender(Meteor.settings.private.fcmApiToken);
     const user = Meteor.users.findOne({ _id: notif.userId });