Courier | 4,983 followers on LinkedIn. Build better notifications with Courier ✉ The API engineers trust. | Courier is the notifications platform leading companies use to power notifications across every channel. With a single API call, you can send email, in-app, push, SMS, chat, Slack, and Microsoft Teams—while easily controlling every part of the experience: design, routing, and user preferences. That’s why modern software teams choose Courier to build reliable, scalable notifications that grow with their product.