Take a look at Bridge (https://www.getbridge.com https://www.getbridge.com). You could use that to create a worker responsible for sending mail. Use Bridge to a

Take a look at Bridge (https://www.getbridge.com https://www.getbridge.com). You could use that to create a worker responsible for sending mail. Use Bridge to asynchronously route emails to that worker. When you need to scale your send mail worker, just fire up more instances of that worker and Bridge load balances and scales your worker queue.