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
diff --git a/config/sidekiq.yml b/config/sidekiq.yml
index 1c7a4e2cd..4ceb7b31f 100644
--- a/config/sidekiq.yml
+++ b/config/sidekiq.yml
@@ -4,4 +4,5 @@
 :queues:
   - [default, 3]
   - [searchkick, 10]
-  - [notify, 100]
\ No newline at end of file
+  - [notify, 100]
+  - [mailers, 101]