diff --git a/Gemfile b/Gemfile
index 7f8aa8b..3b9bf4d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -73,3 +73,7 @@ gem 'webpacker-react', '~> 0.3.2'
 gem 'js-routes'
 gem 'rollbar'
 gem 'newrelic_rpm'
+gem 'sidekiq'
+gem 'sidekiq-failures'
+gem 'sidekiq-throttled'
+gem 'sidekiq-unique-jobs'
diff --git a/Gemfile.lock b/Gemfile.lock
index 161fda5..f35b45e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,6 +81,9 @@ GEM
     bindex (0.8.1)
     bootsnap (1.9.1)
       msgpack (~> 1.0)
+    brpoplpush-redis_script (0.1.2)
+      concurrent-ruby (~> 1.0, >= 1.0.5)
+      redis (>= 1.0, <= 5.0)
     builder (3.2.4)
     bullet (7.0.0)
       activesupport (>= 3.0.0)
@@ -99,6 +102,7 @@ GEM
       activesupport
     childprocess (4.1.0)
     concurrent-ruby (1.1.9)
+    connection_pool (2.2.5)
     coveralls (0.7.1)
       multi_json (~> 1.3)
       rest-client
@@ -220,6 +224,8 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    redis (4.5.1)
+    redis-prescription (1.0.0)
     regexp_parser (2.1.1)
     responders (3.0.1)
       actionpack (>= 5.0)
@@ -259,6 +265,21 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2)
     semantic_range (3.0.0)
+    sidekiq (6.4.0)
+      connection_pool (>= 2.2.2)
+      rack (~> 2.0)
+      redis (>= 4.2.0)
+    sidekiq-failures (1.0.1)
+      sidekiq (>= 4.0.0)
+    sidekiq-throttled (0.15.0)
+      concurrent-ruby
+      redis-prescription
+      sidekiq
+    sidekiq-unique-jobs (7.1.12)
+      brpoplpush-redis_script (> 0.1.1, <= 2.0.0)
+      concurrent-ruby (~> 1.0, >= 1.0.5)
+      sidekiq (>= 5.0, < 8.0)
+      thor (>= 0.20, < 3.0)
     simple_form (5.1.0)
       actionpack (>= 5.2)
       activemodel (>= 5.2)
@@ -357,6 +378,10 @@ DEPENDENCIES
   rubocop
   sass-rails (>= 6)
   selenium-webdriver
+  sidekiq
+  sidekiq-failures
+  sidekiq-throttled
+  sidekiq-unique-jobs
   simple_form
   simplecov
   simplecov-lcov
diff --git a/app/controllers/api/v1/tasks_controller.rb b/app/controllers/api/v1/tasks_controller.rb
index 08c85f8..8d1048e 100644
--- a/app/controllers/api/v1/tasks_controller.rb
+++ b/app/controllers/api/v1/tasks_controller.rb
@@ -19,7 +19,7 @@ def create
     task = current_user.my_tasks.new(task_params)
 
     if task.save
-      UserMailer.with({ user: current_user, task: task }).task_created.deliver_now
+      SendTaskCreateNotificationJob.perform_async(task.id)
     end
 
     respond_with(task, serializer: TaskSerializer, location: nil)
@@ -29,7 +29,7 @@ def update
     task = Task.find(params[:id])
 
     if task.update(task_params)
-      UserMailer.with({ task: task }).task_updated.deliver_now
+      SendTaskUpdateNotificationJob.perform_async(task.id)
     end
 
     respond_with(task, serializer: TaskSerializer)
@@ -39,7 +39,7 @@ def destroy
     task = Task.find(params[:id])
 
     if task.destroy
-      UserMailer.with({ task: task }).task_destroyed.deliver_now
+      SendTaskDestroyNotificationJob.perform_async(task.id)
     end
 
     respond_with(task)
diff --git a/app/jobs/application_job.rb b/app/jobs/application_job.rb
index d394c3d..2641584 100644
--- a/app/jobs/application_job.rb
+++ b/app/jobs/application_job.rb
@@ -1,7 +1,4 @@
-class ApplicationJob < ActiveJob::Base
-  # Automatically retry jobs that encountered a deadlock
-  # retry_on ActiveRecord::Deadlocked
-
-  # Most jobs are safe to ignore if the underlying records are no longer available
-  # discard_on ActiveJob::DeserializationError
+class ApplicationJob
+  include Sidekiq::Worker
+  include Sidekiq::Throttled::Worker
 end
diff --git a/app/jobs/send_password_reset_notification_job.rb b/app/jobs/send_password_reset_notification_job.rb
new file mode 100644
index 0000000..a2382a5
--- /dev/null
+++ b/app/jobs/send_password_reset_notification_job.rb
@@ -0,0 +1,11 @@
+class SendPasswordResetNotificationJob < ApplicationJob
+  sidekiq_options queue: :mailers
+  sidekiq_throttle_as :mailer
+
+  def perform(user_id)
+    user = User.find_by(id: user_id)
+    return if user.blank?
+
+    UserMailer.with({ user: user }).reset_password.deliver_now
+  end
+end
diff --git a/app/jobs/send_task_create_notification_job.rb b/app/jobs/send_task_create_notification_job.rb
new file mode 100644
index 0000000..b7105eb
--- /dev/null
+++ b/app/jobs/send_task_create_notification_job.rb
@@ -0,0 +1,11 @@
+class SendTaskCreateNotificationJob < ApplicationJob
+  sidekiq_options queue: :mailers
+  sidekiq_throttle_as :mailer
+
+  def perform(task_id)
+    task = Task.find_by(id: task_id)
+    return if task.blank?
+
+    UserMailer.with(user: task.author, task: task).task_created.deliver_now
+  end
+end
diff --git a/app/jobs/send_task_destroy_notification_job.rb b/app/jobs/send_task_destroy_notification_job.rb
new file mode 100644
index 0000000..83464aa
--- /dev/null
+++ b/app/jobs/send_task_destroy_notification_job.rb
@@ -0,0 +1,11 @@
+class SendTaskDestroyNotificationJob < ApplicationJob
+  sidekiq_options queue: :mailers
+  sidekiq_throttle_as :mailer
+
+  def perform(task_id)
+    task = Task.find_by(id: task_id)
+    return if task.blank?
+
+    UserMailer.with(user: task.author, task: task).task_destroyed.deliver_now
+  end
+end
diff --git a/app/jobs/send_task_update_notification_job.rb b/app/jobs/send_task_update_notification_job.rb
new file mode 100644
index 0000000..78734cc
--- /dev/null
+++ b/app/jobs/send_task_update_notification_job.rb
@@ -0,0 +1,12 @@
+class SendTaskUpdateNotificationJob < ApplicationJob
+  sidekiq_options queue: :mailers
+  sidekiq_options lock: :until_and_while_executing, on_conflict: { client: :log, server: :reject }
+  sidekiq_throttle_as :mailer
+
+  def perform(task_id)
+    task = Task.find_by(id: task_id)
+    return if task.blank?
+
+    UserMailer.with(user: task.author, task: task).task_updated.deliver_now
+  end
+end
diff --git a/app/services/user_service.rb b/app/services/user_service.rb
index 4c2798f..492fa85 100644
--- a/app/services/user_service.rb
+++ b/app/services/user_service.rb
@@ -3,7 +3,7 @@ def self.reset_password!(user)
     token = SecureRandom.hex(10)
     user.update!(reset_digest: token, reset_sent_at: Time.current)
 
-    UserMailer.with({ user: user }).reset_password.deliver_now
+    SendPasswordResetNotificationJob.perform_async(user.id)
   end
 
   def self.password_reset_period_valid?(user)
diff --git a/config/application.rb b/config/application.rb
index f50bc78..95a1b7a 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -12,6 +12,8 @@ class Application < Rails::Application
     config.load_defaults 6.1
     config.assets.paths << Rails.root.join('node_modules')
 
+    config.active_job.queue_adapter = :sidekiq
+
     # Configuration for the application, engines, and railties goes here.
     #
     # These settings can be overridden in specific environments using the files
diff --git a/config/initializers/sidekiq.rb b/config/initializers/sidekiq.rb
new file mode 100644
index 0000000..4263441
--- /dev/null
+++ b/config/initializers/sidekiq.rb
@@ -0,0 +1,16 @@
+require 'sidekiq/web'
+require "sidekiq/throttled"
+require "sidekiq/throttled/web"
+require 'sidekiq_unique_jobs/web'
+
+Sidekiq::Throttled.setup!
+
+Sidekiq::Throttled::Registry.add(:mailer, { threshold: { limit: 1, period: 5.seconds } })
+
+Sidekiq.configure_server do |config|
+  config.redis = { url: ENV['REDIS_URL'] }
+end
+
+Sidekiq.configure_client do |config|
+  config.redis = { url: ENV['REDIS_URL'] }
+end
diff --git a/config/routes.rb b/config/routes.rb
index 346b34a..299849a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  mount Sidekiq::Web => '/admin/sidekiq'
   mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.env.development?
 
   root :to => "web/boards#show"
diff --git a/config/sidekiq.yml b/config/sidekiq.yml
new file mode 100644
index 0000000..f4b932e
--- /dev/null
+++ b/config/sidekiq.yml
@@ -0,0 +1,6 @@
+---
+:concurrency: 5
+:verbose: true
+:queues:
+  - default
+  - mailers
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index 2dd329a..9ea9fb7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,7 +14,10 @@ services:
       - 3002:3002
     depends_on:
       - db
+      - redis
+      - sidekiq
     environment: &web-environment
+      REDIS_URL: redis://redis
       BUNDLE_PATH: /bundle_cache
       GEM_HOME: /bundle_cache
       GEM_PATH: /bundle_cache
@@ -24,7 +27,6 @@ services:
       DATABASE_USERNAME: postgres
       DATABASE_PASSWORD: postgres
     command: bundle exec rails s -b '0.0.0.0' -p 3000
-
   db:
     image: postgres:11.4
     ports:
@@ -32,6 +34,15 @@ services:
     environment:
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: postgres
+  sidekiq:
+    build: .
+    command: bundle exec sidekiq -C /task_manager/config/sidekiq.yml
+    environment: *web-environment
+    volumes: *web-volumes
+    depends_on:
+      - redis
+  redis:
+    image: redis:5.0.9-alpine
 
 volumes:
   bundle_cache:
\ No newline at end of file
diff --git a/test/mailers/user_mailer_test.rb b/test/mailers/user_mailer_test.rb
index 63f7c3b..8e4ab0a 100644
--- a/test/mailers/user_mailer_test.rb
+++ b/test/mailers/user_mailer_test.rb
@@ -8,7 +8,7 @@ class UserMailerTest < ActionMailer::TestCase
     email = UserMailer.with(params).task_created
 
     assert_emails 1 do
-      email.deliver_now
+      email.deliver_later
     end
 
     assert_equal ['noreply@taskmanager.com'], email.from
@@ -25,7 +25,7 @@ class UserMailerTest < ActionMailer::TestCase
     email = UserMailer.with({ user: user }).reset_password
 
     assert_emails 1 do
-      email.deliver_now
+      email.deliver_later
     end
 
     assert_equal ['noreply@taskmanager.com'], email.from
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 9962dfc..94a3ff7 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -21,6 +21,9 @@
 ENV['RAILS_ENV'] ||= 'test'
 require_relative '../config/environment'
 require 'rails/test_help'
+require 'sidekiq/testing'
+
+Sidekiq::Testing.inline!
 
 class ActiveSupport::TestCase
   include ActionMailer::TestHelper