diff --git a/app/jobs/maintenance_job.rb b/app/jobs/maintenance_job.rb
index 2a33570..114ff77 100644
--- a/app/jobs/maintenance_job.rb
+++ b/app/jobs/maintenance_job.rb
@@ -22,9 +22,15 @@ class MaintenanceJob < ApplicationJob
 
     # XXX: Parece que [0] es más rápido que []#first
     Usuarie.all.pluck(:email, :lang).each do |u|
-      MaintenanceMailer.with(maintenance: maintenance,
-                             email: u[0],
-                             lang: u[1]).send(mailer).deliver_now
+      begin
+        MaintenanceMailer.with(maintenance: maintenance,
+                               email: u[0],
+                               lang: u[1]).public_send(mailer).deliver_now
+      rescue Net::SMTPServerBusy => e
+        # Algunas direcciones no son válidas, no queremos detener el
+        # envío pero sí enterarnos cuáles son
+        ExceptionNotifier.notify_exception e
+      end
     end
   end
 end