Revert "Actually fix mail"

This reverts commit dfc3605ff9085b95b699b51dd07aa8344d49bc03.

config/environments/production.rb

   config.active_record.dump_schema_after_migration = false
 
   config.action_mailer.delivery_method = :smtp
-  config.action_mailer.smtp_settings = {
-    address: 'localhost',
-    port: 25,
-    openssl_verify_mode: OpenSSL::SSL::VERIFY_NONE,
+  config.action_mailer.mailgun_settings = {
     domain: 'mail.maartenberg.nl'
   }
-  config.action_mailer.default_options = {
-    from: 'Aardbei <aardbei@maartenberg.nl>'
-  }
 end