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Create e-mail responses with Fastmail and OpenAI

VitaliVitali
3298 views
2/3/2026
Multi-SourceData ProcessingData TransformationHTTP RequestETL
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Workflow Description:

This n8n workflow automates the drafting of email replies for Fastmail using OpenAI's GPT-4 model. Here’s the overall process:

  1. Email Monitoring: The workflow continuously monitors a specified IMAP inbox for new, unread emails.
  2. Email Data Extraction: When a new email is detected, it extracts relevant details such as the sender, subject, email body, and metadata.
  3. AI Response Generation: The extracted email content is sent to OpenAI's GPT-4, which generates a personalized draft response.
  4. Get Fastmail Session and Mailbox IDs: Connects to the Fastmail API to retrieve necessary session details and mailbox IDs.
  5. Draft Identification: Identifies the "Drafts" folder in the mailbox.
  6. Draft Preparation: Compiles all the necessary information to create the draft, including the generated response, original email details, and specified recipient.
  7. Draft Uploading: Uploads the prepared draft email to the "Drafts" folder in the Fastmail mailbox.

Prerequisites:

  1. IMAP Email Account: You need to configure an IMAP email account in n8n to monitor incoming emails.
  2. Fastmail API Credentials: A Fastmail account with JMAP API enabled. You should set up HTTP Header authentication in n8n with your Fastmail API credentials.
  3. OpenAI API Key: An API key from OpenAI to access GPT-4. Make sure to configure the OpenAI credentials in n8n.

Configuration Steps:

  1. Email Trigger (IMAP) Node:

    • Provide your email server settings and credentials to monitor emails.

  2. HTTP Request Nodes for Fastmail:

    • Set up HTTP Header authentication in n8n using your Fastmail API credentials.
    • Replace the httpHeaderAuth credential IDs with your configured credential IDs.

  3. OpenAI Node:

    • Configure the OpenAI API key in n8n.
    • Replace the openAiApi credential ID with your configured credential ID.

By following these steps and setting up the necessary credentials, you can seamlessly automate the creation of email drafts in response to new emails using AI-generated content. This workflow helps improve productivity and ensures timely, personalized communication.

Create Email Responses with Fastmail and OpenAI

This n8n workflow automates the process of generating email responses using OpenAI based on incoming emails from a Fastmail account. It acts as a smart assistant, reading your emails, generating a draft response, and providing it for your review.

What it does

  1. Triggers on New Emails: The workflow starts by listening for new emails in a configured IMAP mailbox (e.g., Fastmail).
  2. Extracts Email Content: It extracts relevant information from the incoming email, such as the sender, subject, and body.
  3. Prepares Data for OpenAI: It structures the extracted email content into a format suitable for the OpenAI API.
  4. Generates Email Response with OpenAI: It sends the email content to OpenAI to generate a draft response.
  5. Splits OpenAI Response: It processes the OpenAI response to extract the generated email body.
  6. Sets Output Fields: It prepares the final output, including the original email's sender, subject, and the OpenAI-generated response.

Prerequisites/Requirements

  • n8n Instance: A running instance of n8n.
  • IMAP Email Account: An IMAP-enabled email account (e.g., Fastmail) to act as the trigger. You will need the IMAP server details, username, and password.
  • OpenAI API Key: An OpenAI account with an active API key for generating text.

Setup/Usage

  1. Import the Workflow:
    • Download the provided JSON file for this workflow.
    • In your n8n instance, click on "Workflows" in the left sidebar.
    • Click "New" and then "Import from JSON".
    • Paste the workflow JSON or upload the file.
  2. Configure Credentials:
    • Email Trigger (IMAP):
      • Click on the "Email Trigger (IMAP)" node.
      • Under "Credentials", click "Create New".
      • Select "IMAP API" as the credential type.
      • Enter your IMAP server address (e.g., imap.fastmail.com), port (usually 993), username, and password.
      • Save the credential.
    • OpenAI:
      • Click on the "OpenAI" node.
      • Under "Credentials", click "Create New".
      • Select "OpenAI API" as the credential type.
      • Enter your OpenAI API Key.
      • Save the credential.
  3. Activate the Workflow:
    • Once all credentials are configured, click the "Activate" toggle in the top right corner of the workflow editor to enable it.

The workflow will now automatically check your configured IMAP mailbox for new emails and generate draft responses using OpenAI. The generated responses will be available in the output of the "Edit Fields" node, allowing you to review and integrate them into your email client.

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