diff --git a/.gitignore b/.gitignore
index 160c8ab..409733f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@
 # Ignore master key for decrypting credentials and more.
 /config/master.key
 /config/database.yml
+/config/chexpire.yml
 /public/packs
 /public/packs-test
 /node_modules
diff --git a/.travis.yml b/.travis.yml
index 4bd83fc..48e05b4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,7 @@ addons:
 
 before_install:
   - cp config/database.example.yml config/database.yml
+  - cp config/chexpire.test.yml config/chexpire.yml
 
 install:
   - bundle install
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index 3c34c81..1474cb7 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -1,4 +1,4 @@
 class ApplicationMailer < ActionMailer::Base
-  default from: "from@example.com"
+  default from: Rails.configuration.chexpire.fetch("mailer_default_from")
   layout "mailer"
 end
diff --git a/config/application.rb b/config/application.rb
index d5b5a21..5adecf8 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -31,5 +31,7 @@ module Chexpire
     end
 
     config.time_zone = "Europe/Paris"
+
+    config.chexpire = config_for(:chexpire)
   end
 end
diff --git a/config/chexpire.example.yml b/config/chexpire.example.yml
new file mode 100644
index 0000000..8c74f9e
--- /dev/null
+++ b/config/chexpire.example.yml
@@ -0,0 +1,13 @@
+default: &default
+  mailer_default_from: "from@example.org"
+
+production:
+  <<: *default
+  host: "example.org"
+
+development:
+  <<: *default
+  host: "chexpire.local"
+
+# test configuration included in file used by CI services
+<%= IO.read Rails.root.join("config", "chexpire.test.yml") %>
diff --git a/config/chexpire.test.yml b/config/chexpire.test.yml
new file mode 100644
index 0000000..152302f
--- /dev/null
+++ b/config/chexpire.test.yml
@@ -0,0 +1,3 @@
+test:
+  mailer_default_from: "contact@chexpire.org"
+  host: "localhost"
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 4b8cc17..7a6294a 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -37,6 +37,8 @@ Rails.application.configure do
 
   config.action_mailer.perform_caching = false
 
+  config.action_mailer.default_url_options = { host: config.chexpire.fetch("host"), port: 3000 }
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
diff --git a/config/environments/production.rb b/config/environments/production.rb
index a61ba5d..fe21a0d 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -66,6 +66,8 @@ Rails.application.configure do
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   # config.action_mailer.raise_delivery_errors = false
 
+  config.action_mailer.default_url_options = { host: config.chexpire.fetch("host") }
+
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).
   config.i18n.fallbacks = true
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 0a38fd3..77e282b 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -38,6 +38,8 @@ Rails.application.configure do
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
 
+  config.action_mailer.default_url_options = { host: config.chexpire.fetch("host"), port: 3000 }
+
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr