AI Fastmail Reply Drafter using n8n and OpenAI

Unlock Effortless Email Triage & Reply Drafting with this AI Agent

This n8n AI Agent acts as your personal email assistant for Fastmail accounts. It connects to your IMAP-enabled inbox, retrieves new messages, and leverages OpenAI's GPT-4o model to understand the content and generate contextually appropriate draft replies. The agent then uses the Fastmail JMAP API to create these replies and save them directly into your 'Drafts' folder, ready for your review and sending. This significantly speeds up your email workflow, especially for common inquiries or follow-ups.

Key Features & Benefits

• Automated Email Monitoring: Triggers on new, unread emails via IMAP.
• Intelligent Reply Generation: Utilizes OpenAI GPT-4o for creating casual, personalized draft responses, adapting formality (e.g., Du/Sie in German) based on the original email's language and tone.
• Fastmail Integration: Seamlessly interacts with Fastmail using the JMAP API to fetch mailbox information (like the Drafts folder ID) and upload draft emails.
• Context-Aware Drafting: Extracts key email details (sender, subject, body, message-ID) to provide rich context for AI-generated replies.
• Direct to Drafts: Saves AI-generated replies directly to your Fastmail 'Drafts' folder, allowing for quick review and dispatch.
• Time-Saving Automation: Frees you up from the repetitive task of drafting routine email replies, boosting productivity.

• An n8n instance (Cloud or self-hosted).
• IMAP Email Account: Credentials for the email account you want to monitor, configured in n8n.
• Fastmail API Credentials: A Fastmail account with JMAP API enabled. You'll need to set up HTTP Header authentication in n8n using your Fastmail API token (typically an app-specific password or API token for JMAP).
• OpenAI API Key: An API key from OpenAI with access to a suitable model (e.g., gpt-4o), configured in n8n.

1. Download the n8n workflow JSON file.
2. Import the workflow into your n8n instance.
3. IMAP Trigger: Configure the 'Email Trigger (IMAP)' node with your email account credentials. Adjust options like 'customEmailConfig' for 'UNSEEN' emails if needed.
4. OpenAI Node: In the 'OpenAI' node, add your OpenAI API credential and select the desired model (e.g., gpt-4o). You can customize the prompt in the 'Messages' parameter to tailor the AI's response style.
5. Fastmail Credentials:
   • Create a new 'Header Auth' credential in n8n for Fastmail. The header name is Authorization, and the value format is typically Bearer YOUR_FASTMAIL_JMAP_TOKEN. (Consult Fastmail JMAP API documentation for precise token generation and header format).
   • Assign this Fastmail credential to the 'Session', 'Get Mailbox IDs', and 'upload draft email' HTTP Request nodes.
6. Verify Expressions: Double-check the JMAP API call structures and JSONPath expressions in the 'Get Mailbox IDs' (for accountId), 'Filter for drafts folder' (for role: "drafts"), and 'gather data for draft email' (for constructing the reply) nodes. Ensure they align with your Fastmail account's JMAP responses and your desired output format.
7. Activate the workflow. Test thoroughly by sending an email to the monitored inbox to ensure drafts are generated as expected in Fastmail.