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Auto-categorize Gmail emails with AI and send prioritized Slack alerts

Matt Chong | n8n CreatorMatt Chong | n8n Creator
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2/3/2026
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Who is this for?

  • Teams using Gmail and Slack who want to streamline email handling.
  • Customer support, sales, and operations teams that want emails sorted by topic and priority automatically.
  • Anyone tired of manually triaging customer emails.

What does it solve?

  • Stops important messages from slipping through the cracks.
  • Automatically identifies the nature and urgency of incoming emails.
  • Routes emails to the right Slack channel with a clear, AI-generated summary.

How it works

  • The workflow watches for unread emails in your Gmail inbox.
  • It fetches the full email content and passes it to OpenAI for classification.
  • The AI returns structured JSON with the email’s category, priority, summary, and sender.
  • Based on the AI result, it assigns a label and Slack channel.
  • A message is sent to the right Slack channel with the details.

How to setup?

  1. Connect credentials:

    • Gmail (OAuth2)
    • Slack (OAuth2)
    • OpenAI (API Key)

  2. Adjust email polling:

    • Open the Gmail Trigger node and set how frequently it should check for new emails.

  3. Verify routing settings:

    • In the “Routing Map” node, update Slack channel IDs for each category if needed.

  4. Customize AI behavior (optional):

    • Tweak the AI Agent prompt to better match your internal categorization rules.

How to customize this workflow to your needs

  • Add more categories: Update the AI prompt and the schema in the “Structured Output Parser.”
  • Change Slack formatting: Modify the message text in the Slack node to include links, emojis, or mentions.
  • Use different routing logic: Expand the Routing Map to assign based on keywords, domains, or even sentiment.
  • Add escalation workflows: Trigger follow-up actions for high-priority or complaint emails.

Auto-Categorize Gmail Emails with AI and Send Prioritized Slack Alerts

This n8n workflow automates the process of categorizing incoming Gmail emails using AI, extracting key information, and then sending prioritized alerts to a Slack channel based on the email content. It helps teams stay on top of important communications without manually sifting through every email.

What it does

  1. Monitors Gmail: Continuously checks for new emails in a specified Gmail account.
  2. Extracts Email Content: Retrieves the subject, sender, and body of each new email.
  3. Analyzes with AI: Sends the email content to an AI Agent (powered by OpenAI) to categorize the email and extract specific details (e.g., priority, summary, required action).
  4. Parses AI Output: Uses a Structured Output Parser to extract the categorized data from the AI's response in a structured format.
  5. Formats Data: Organizes the extracted information into a clear, readable format.
  6. Sends Slack Alert: Posts a detailed alert to a designated Slack channel, including the email's category, priority, summary, and suggested action.

Prerequisites/Requirements

  • n8n Instance: A running n8n instance.
  • Gmail Account: A Google account with Gmail enabled and configured as an n8n credential.
  • OpenAI API Key: An OpenAI API key configured as an n8n credential for the AI Agent.
  • Slack Account: A Slack workspace and a Slack API token configured as an n8n credential.

Setup/Usage

  1. Import the Workflow:
    • Download the provided JSON file.
    • In your n8n instance, click "Workflows" in the left sidebar.
    • Click "New" and then "Import from JSON".
    • Paste the workflow JSON or upload the file.
  2. Configure Credentials:
    • Gmail Trigger: Click on the "Gmail Trigger" node and select or create a new "Gmail API" credential. Ensure it has access to read your emails.
    • AI Agent: Click on the "AI Agent" node and ensure your "OpenAI API" credential is selected.
    • OpenAI Chat Model: Click on the "OpenAI Chat Model" node and ensure your "OpenAI API" credential is selected.
    • Slack: Click on the "Slack" node and select or create a new "Slack API" credential. Configure the "Channel" where you want the alerts to be posted.
  3. Activate the Workflow:
    • Once all credentials are set up and the workflow is configured to your liking, click the "Activate" toggle in the top right corner of the n8n editor to start the workflow.

The workflow will now automatically monitor your Gmail for new emails, process them with AI, and send prioritized alerts to Slack.

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