Sendinblue email balancing using proper credentials

This reverts commit c61981e795.

config/environments/production.rb

@@ -77,6 +77,16 @@ Rails.application.configure do
       port: '2525',
       authentication: :cram_md5
     }
+  elsif ENV['SENDINBLUE_ENABLED'] == 'enabled'
+    config.action_mailer.delivery_method = :smtp
+    config.action_mailer.smtp_settings = {
+      user_name: Rails.application.secrets.sendinblue[:username],
+      password: Rails.application.secrets.sendinblue[:client_key],
+      address: 'smtp-relay.sendinblue.com',
+      domain: 'smtp-relay.sendinblue.com',
+      port: '587',
+      authentication: :cram_md5
+    }
   else
     config.action_mailer.delivery_method = :mailjet
   end