Chore: Configure Letter opener with environment variable (#880)

.env.example

@@ -105,3 +105,7 @@ CHARGEBEE_WEBHOOK_PASSWORD=
 
 ## Bot Customizations
 USE_INBOX_AVATAR_FOR_BOT=true
+
+## Development Only Config
+# if you want to use letter_opener for local emails
+# LETTER_OPENER=true

config/environments/development.rb

@@ -34,18 +34,12 @@ Rails.application.configure do
 
   config.active_job.queue_adapter = :sidekiq
 
+  # Email related config
   config.action_mailer.perform_caching = false
-  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
-
   config.action_mailer.perform_deliveries = true
   config.action_mailer.raise_delivery_errors = true
-  config.action_mailer.default_url_options = { host: 'localhost:3000' }
+  config.action_mailer.default_url_options = { host: ENV['FRONTEND_URL'] }
 
-  # If you want to use letter opener instead of mailhog for testing emails locally,
-  # uncomment the following line L49 and comment lines L51 through to L65
-  # config.action_mailer.delivery_method = :letter_opener
-
-  config.action_mailer.delivery_method = :smtp
   smtp_settings = {
     port: ENV['SMTP_PORT'] || 25,
     domain: ENV['SMTP_DOMAIN'] || 'localhost',
@@ -59,7 +53,12 @@ Rails.application.configure do
     smtp_settings[:enable_starttls_auto] = ENV['SMTP_ENABLE_STARTTLS_AUTO'] if ENV['SMTP_ENABLE_STARTTLS_AUTO'].present?
   end
 
+  if ENV['LETTER_OPENER']
+    config.action_mailer.delivery_method = :letter_opener
+  else
+    config.action_mailer.delivery_method = :smtp
     config.action_mailer.smtp_settings = smtp_settings
+  end
 
   # Set this to appropriate ingress service for which the options are :
   # :relay for Exim, Postfix, Qmail
@@ -69,7 +68,7 @@ Rails.application.configure do
   # :sendgrid for Sendgrid
   config.action_mailbox.ingress = ENV.fetch('RAILS_INBOUND_EMAIL_SERVICE', 'relay').to_sym
 
-  Rails.application.routes.default_url_options = { host: 'localhost', port: 3000 }
+  Rails.application.routes.default_url_options = { host: ENV['FRONTEND_URL'] }
 
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log