Whitelabeling emails is a process to transform emails so they appear as if coming from another brand, making it easier for customers to match their employer's or sub-brand logos. Courier's Brands feature simplifies this process by allowing developers to create, update, and delete brands programmatically, saving time and effort. With Brands, users can also create custom reusable code using Snippets, which can be managed programmatically or customized in the UI. Sending whitelabeled emails is straightforward, with options to choose a specific brand in the UI or set it programmatically through API calls. Courier offers a free plan for up to 10 brands and 10,000 notifications, as well as libraries for various programming languages and a demo request process.