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Compose reply draft in Gmail with OpenAI Assistant

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Automate Gmail Replies with OpenAI Assistant

This workflow leverages OpenAI Assistant to draft personalized replies for labeled email messages and connects the drafts directly to the relevant Gmail threads.

💡 Enhance reply customization by adding a knowledge base to your OpenAI Assistant, allowing it to respond with tailored information (e.g., providing product details for customer inquiries).

📺 Watch this workflow in action in my YouTube tutorial on Gmail automation.

How it Works

The workflow runs at set intervals (default: every 1 minute, adjustable) to check for emails with a specific label (e.g., "AI").

It retrieves labeled emails, forwards their content to the OpenAI Assistant, and generates a draft reply. The draft is formatted in HTML, converted to a raw RFC-compliant message, and connected to the original thread ID in Gmail.

💡 Learn more about composing Gmail drafts in Google's API documentation.

Finally, the trigger label (e.g., "AI") is removed from the email to prevent looping.

Setup Steps

  1. Set up credentials for Gmail and OpenAI.
  2. Create a label in Gmail for messages to be handled by this workflow (e.g., "AI").
  3. Select this label in the Gmail nodes in the workflow.
  4. Create and configure your OpenAI Assistant, selecting it in the "OpenAI Assistant" node.
  5. Optionally, adjust the trigger interval (default is 1 minute).

If you enjoy this workflow, subscribe to my YouTube channel and/or my newsletter.

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