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Multilingual email auto-replies with DeepL, GPT-4o and Slack human approval

AsukaAsuka
39 views
2/3/2026
Data ExportGoogle SheetsAutomationDatabase SyncNotion
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Who's it for

Customer support teams, sales representatives, and international business professionals who need to handle multilingual email communication efficiently while maintaining quality control through human approval.

How it works

This workflow automates email responses by:

  1. Monitoring Gmail for emails with a specific label (e.g., "To_Process")
  2. Translating the email content using DeepL to your preferred language
  3. Generating an AI-powered summary and draft reply using OpenAI
  4. Requesting approval via Slack with a summary and one-click approval link
  5. Sending the reply only after human approval is received
  6. Removing the label to prevent reprocessing

Set up steps

Setup takes approximately 15-20 minutes:

  1. Configure credentials for Gmail, DeepL, OpenAI, and Slack
  2. Create a Gmail label for emails to process
  3. Update the Slack channel ID in the configuration node
  4. Ensure n8n is accessible via webhook (tunnel or production mode required)

Requirements

  • Gmail account with OAuth2 authentication
  • DeepL API key (free tier available)
  • OpenAI API key
  • Slack workspace with OAuth2 app configured
  • n8n instance accessible via webhook URL

How to customize the workflow

  • Change translation language: Modify the DeepL node's target language
  • Adjust AI model: Switch between GPT-4 or GPT-3.5 in the OpenAI node
  • Customize approval message: Edit the Slack message format
  • Add multiple languages: Duplicate the translation node for multi-language support
  • Filter specific senders: Add conditions to process only certain email addresses

Multilingual Email Auto-Replies with DeepL, GPT-4o, and Slack Human Approval

This n8n workflow automates the process of generating multilingual email auto-replies with human oversight. It listens for new emails, translates them, generates a reply using an AI model, and then sends the generated reply to Slack for human approval before sending it back to the original sender.

What it does

  1. Triggers on New Emails: Listens for new emails in a specified Gmail inbox.
  2. Sets Initial Fields: Initializes and prepares data for subsequent steps (though this specific "Edit Fields" node appears to be a placeholder or for general data manipulation, not explicitly configured in the provided JSON).
  3. Translates Incoming Email: Uses DeepL to translate the incoming email body into a specified target language (e.g., English) if it's not already in that language.
  4. Generates AI Reply: Leverages OpenAI (likely GPT-4o, given the context name) to generate a draft reply based on the translated email content.
  5. Sends for Human Approval: Posts the generated reply to a Slack channel, awaiting human review and approval.
  6. Waits for Approval: Pauses the workflow execution until a human action (approval/rejection) is received from Slack.
  7. Sends Approved Reply (Implicit): Although not explicitly shown with a "Send Email" node in the provided JSON, the typical flow after Slack approval would be to send the approved reply via Gmail. The current JSON only shows the Slack node for approval.
  8. Handles Rejection (Implicit): Similarly, if the reply is rejected in Slack, the workflow would typically handle this (e.g., notify the sender, log the rejection).

Prerequisites/Requirements

  • n8n Instance: A running n8n instance to host the workflow.
  • Gmail Account: Configured with n8n credentials to trigger on new emails and send replies.
  • DeepL Account: An API key for DeepL to translate email content.
  • OpenAI Account: An API key for OpenAI (e.g., GPT-4o) to generate email replies.
  • Slack Account: A Slack workspace and an app/bot token configured with n8n credentials to post messages and receive human approvals.

Setup/Usage

  1. Import the Workflow: Download the provided JSON and import it into your n8n instance.
  2. Configure Credentials:
    • Gmail Trigger & Gmail Node: Set up your Gmail OAuth2 or API key credentials.
    • DeepL Node: Provide your DeepL API key.
    • OpenAI Node: Provide your OpenAI API key.
    • Slack Node: Set up your Slack API token credentials.
  3. Customize Nodes:
    • Gmail Trigger: Specify the mailbox, labels, or search queries to monitor for incoming emails.
    • DeepL: Configure the source and target languages for translation.
    • OpenAI: Adjust the prompt to guide the AI in generating appropriate email replies.
    • Slack: Configure the Slack channel where approval requests will be posted. Customize the message format for approval.
  4. Activate the Workflow: Once configured, activate the workflow in n8n to start processing emails.

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