We use Beanstalkd actively to process 50M emails per month, and it does a great job. We never had any issues with it, and setup is very easy, you have a nice ad

We use Beanstalkd actively to process 50M emails per month, and it does a great job. We never had any issues with it, and setup is very easy, you have a nice admin console panel to help you in development and monitor your tubes https://github.com/ptrofimov/beanstalk_console https://github.com/ptrofimov/beanstalk_console