It's still a bit like the Wild West out there when it comes to SMS and MMS. Each carrier has its own rules and practices. For many carriers, sending or receiving too many messages too quickly will set off spam warnings, which results in messages either not being sent or not being received. This can be a real problem when you need to send information to a lot of people at once.

Fear not. We've got you covered. Out of the box, Rock comes configured with Long Code Throttling. This slows the delivery of non-short code numbers. By default, it is set to 500 milliseconds, or half of a second, which is the rate we've found works best for both speed and reliable delivery. You can modify the rate, though, by changing your Twilio transport settings (Admin Tools > Settings > Communication Transports). You can also disable Long Code Throttling altogether. Keep in mind, though, that this may result in your messages not being delivered.