Create "config/settings/identity.yml"

app/mailers/application_mailer.rb

@@ -3,5 +3,5 @@
 class ApplicationMailer < ActionMailer::Base
   layout 'mailer'
 
-  default from: Rails.application.config.noreply_email_contact
+  default from: Rails.application.settings(:identity)[:noreply_email_contact]
 end

config/application.rb

@@ -38,19 +38,11 @@ module Partynest
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 5.2
 
-    # Fully qualified domain name.
-    config.site_domain = 'libertarian-party.com'
-
     # Custom directories with classes and modules you want to be autoloadable.
     config.autoload_paths += [
       config.root.join('app', 'validators'),
     ]
 
-    # Email which all mail is set from.
-    config.noreply_email_address = "no-reply@#{config.site_domain}"
-    config.noreply_email_contact =
-      "Libertarian party of Russia <#{config.noreply_email_address}>"
-
     # Use Sidekiq as ActiveJob adapter.
     config.active_job.queue_adapter = :sidekiq
 

config/environments/development.rb

@@ -40,6 +40,7 @@ Rails.application.configure do
   config.action_mailer.perform_deliveries = true
   config.action_mailer.raise_delivery_errors = true
   config.action_mailer.perform_caching = false
+
   config.action_mailer.default_url_options = {
     host: 'localhost',
     port: 3000,

config/environments/production.rb

@@ -83,7 +83,10 @@ Rails.application.configure do
   config.action_mailer.perform_deliveries = true
   config.action_mailer.raise_delivery_errors = true
   config.action_mailer.perform_caching = false
-  config.action_mailer.default_url_options = { host: config.site_domain }
+
+  config.action_mailer.default_url_options = {
+    host: Rails.application.settings(:identity)[:site_domain],
+  }
 
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).

config/environments/test.rb

@@ -41,6 +41,7 @@ Rails.application.configure do
   config.action_mailer.perform_deliveries = true
   config.action_mailer.raise_delivery_errors = true
   config.action_mailer.perform_caching = false
+
   config.action_mailer.default_url_options = {
     host: 'localhost',
     port: 3000,

config/settings/identity.yml

@@ -0,0 +1,17 @@
+default: &default
+  # Fully qualified domain name.
+  site_domain: 'libertarian-party.com'
+
+  # Email which all mail is sent from.
+  noreply_email_address: 'no-reply@libertarian-party.com'
+  noreply_email_contact: >-
+    Libertarian party of Russia <no-reply@libertarian-party.com>
+
+development:
+  <<: *default
+
+test:
+  <<: *default
+
+production:
+  <<: *default