Send limits are a new feature in the Courier app that allow users to manage notification rate limits, saving money by imposing spending caps on notifications and improving the customer experience by avoiding overwhelming users with too many notifications at once. Send limits can be applied globally or specifically for individual users or subscription topics, offering various levels of control over messaging costs and customer experience. There are different types of send limits, including global message limits, per-user message limits, per-user subscription topic limits, and limit exclusions, which allow users to set rules that bypass other limits for certain subscription topics. Send limits are useful for users who need to stay within a budget, provide a good customer experience, or want fine-grained control over notification limits. The feature is currently available only to business-tier customers, but interested users can request a demo of the offering.