chore: Make SMTP environment variables configurable (#1868)

fixes: #1647

config/environments/production.rb

@@ -76,7 +76,7 @@ Rails.application.configure do
   # Use a different logger for distributed setups.
   # require 'syslog/logger'
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
-  
+
   if ActiveModel::Type::Boolean.new.cast(ENV.fetch('RAILS_LOG_TO_STDOUT', true))
     logger           = ActiveSupport::Logger.new($stdout)
     logger.formatter = config.log_formatter
@@ -98,17 +98,6 @@ 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
 
-  # Chatwoot production settings
-  config.action_mailer.default_url_options = { host: ENV['FRONTEND_URL'] }
-  config.action_mailer.smtp_settings = {
-    address: ENV['SMTP_ADDRESS'],
-    port: ENV['SMTP_PORT'] || 587,
-    user_name: ENV['SMTP_USERNAME'],
-    password: ENV['SMTP_PASSWORD'],
-    authentication: :login,
-    enable_starttls_auto: true
-  }
-
   # Set this to appropriate ingress service for which the options are :
   # :relay for Exim, Postfix, Qmail
   # :mailgun for Mailgun