diff --git a/app/controllers/messages_controller.rb b/app/controllers/messages_controller.rb
index 3cbe5287f..57a5c7fad 100644
--- a/app/controllers/messages_controller.rb
+++ b/app/controllers/messages_controller.rb
@@ -213,7 +213,7 @@ class MessagesController < ApplicationController
 
   def notify_course_students message, course
     course.students.includes(:user).each do |student|
-      UserMailer.course_message_email(student&.user&.mail, message.id).deliver_now if student&.user&.mail
+      UserMailer.course_message_email(student&.user&.mail, message.id).deliver_later if student&.user&.mail
     end
   end
 end