diff --git a/Gemfile b/Gemfile
index 0cf4a1b..db89438 100644
--- a/Gemfile
+++ b/Gemfile
@@ -59,6 +59,7 @@ group :development do
   gem "web-console"
   gem "solargraph", require: false
   gem "solargraph-rails", require: false
+  gem "letter_opener_web"
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 901d9aa..22844ad 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,6 +96,8 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
+    childprocess (5.1.0)
+      logger (~> 1.5)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.3)
     crass (1.0.6)
@@ -159,6 +161,17 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     language_server-protocol (3.17.0.5)
+    launchy (3.1.1)
+      addressable (~> 2.8)
+      childprocess (~> 5.0)
+      logger (~> 1.6)
+    letter_opener (1.10.0)
+      launchy (>= 2.2, < 4)
+    letter_opener_web (3.0.0)
+      actionmailer (>= 6.1)
+      letter_opener (~> 1.9)
+      railties (>= 6.1)
+      rexml
     lint_roller (1.1.0)
     logger (1.7.0)
     loofah (2.24.1)
@@ -445,6 +458,7 @@ DEPENDENCIES
   importmap-rails
   jbuilder
   kamal
+  letter_opener_web
   propshaft
   puma (>= 5.0)
   rails (~> 8.0.2)
diff --git a/config/environments/development.rb b/config/environments/development.rb
index f632a6a..d9ab0ef 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -34,6 +34,9 @@ Rails.application.configure do
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
+  config.action_mailer.delivery_method = :letter_opener
+  config.action_mailer.perform_deliveries = true
+
   # Make template changes take effect immediately.
   config.action_mailer.perform_caching = false
 
diff --git a/config/routes.rb b/config/routes.rb
index 7fb2674..8af9e72 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -12,6 +12,8 @@ Rails.application.routes.draw do
   # get "manifest" => "rails/pwa#manifest", as: :pwa_manifest
   # get "service-worker" => "rails/pwa#service_worker", as: :pwa_service_worker
 
+  mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.env.development?
+
   # Defines the root path route ("/")
   root "moods#index"