With Zapier and OpenAI's GPT-3, users can automatically summarize their email's essential details with just a few clicks, receiving a daily digest that includes critical information from each email. This tutorial guides users through setting up an automated workflow to achieve this, starting by connecting Gmail and OpenAI accounts, then setting up a formatter step to truncate emails, followed by sending the summaries to Slack for notifications or daily digest. The process involves creating a Zapier account, setting up triggers and actions, and configuring the OpenAI prompt and Slack message fields. Users can customize the workflow to suit their needs, including scheduling daily digests and receiving notifications for each email. By automating this process, users can streamline their email management and stay on top of their inbox.