Courier is a notification service that allows developers to send notifications to multiple channels, including Slack and Microsoft Teams, with just a few lines of code using its easy-to-use Python SDK. The process involves creating a Notification Template for Slack and Teams, installing the necessary APIs, and sending a message using Python. Courier's multi-channel functionality enables users to integrate other applications and channels into their notification system, automating notifications in team communication platforms such as Slack and Teams can significantly improve team productivity and communication. By following the steps outlined in this article, developers can set up notification automation with Courier and Python for both Slack and Teams, reducing engineering time and increasing visibility of messaging channels.