# n8n AI Email Responder: Draft Gmail Replies Automatically > Build an n8n agent that reads each new Gmail message and saves a reply as a draft using your real prices and service areas. You stay in control. Free. Source: https://learn.ynteractive.com/content/ai-email-responder-gmail-drafts-n8n · Updated 2026-10-27 · Free from Stepthrough (https://learn.ynteractive.com) ## Practice it step by step [Start the free practice](https://learn.ynteractive.com/modules/email-responder) [Take the free module: why it matters, practice and a quick check →](https://learn.ynteractive.com/courses/n8n-jump-start/13) You do every step yourself in a practice copy of n8n. It checks your work as you go, and “Do it for me” finishes any step you get stuck on. Free, about 12 minutes, and nothing touches your real accounts. [Open full screen](https://learn.ynteractive.com/modules/email-responder) Free · Live now · [Business Automations](https://learn.ynteractive.com/content/course/business-automations) · [n8n](https://learn.ynteractive.com/content/tool/n8n) · Gmail · OpenAI · ~12 min · 68 steps · Intermediate Updated October 27, 2026. Built against the tool’s current screens and checked step by step. [How we check this lesson](https://learn.ynteractive.com/content/about#how-we-check) Answering the same customer questions all day eats your time. In this free AI email responder tutorial you build an [n8n](https://learn.ynteractive.com/content/tool/n8n) agent that checks Gmail every minute, reads each new email and writes a reply as a draft in the same thread. It never sends anything, so you stay in control. ## At a glance | Question | Answer | | --- | --- | | What you build | Build an n8n agent that watches your Gmail, reads each new customer email, and writes a reply as a draft in the same thread, ready for you to check and send. | | Tools | n8n | | Time | About 12 minutes, 68 steps in 11 parts | | Level | Intermediate | | Cost | Free | | Ways to learn it | [Practice it step by step](https://learn.ynteractive.com/modules/email-responder) | ### The 11 parts, in short 1. The email: Look at the inbox, Open the email, Back to n8n. 2. Gmail trigger: Create a workflow, Add the trigger, Search for Gmail, Gmail, and 1 more step. 3. Connect Gmail: Credential, New credential, Sign in with Google, Pick the inbox, and 2 more steps. 4. Gmail trigger: Close the node. 5. AI Agent: Add the next step, Search for the agent, AI Agent, Change the prompt source, and 4 more steps. 6. Chat model: Add the model, Search for OpenAI, OpenAI Chat Model, Credential, and 2 more steps. 7. Draft tool: Add a tool, Search for Gmail, Gmail Tool, Credential, and 15 more steps. 8. Memory: Add memory, Simple Memory, Close the node. 9. Instructions: Open the agent, Add an option, System Message, Give it the facts, and 1 more step. 10. Test and fix: Test it, Open the memory, Find the problem, Define below, and 4 more steps. 11. Check the draft: Check Gmail, Read the draft, then go back, Turn it on, Publish it. **Start here first:** [AI Receipt Extractor: Receipts to Google Sheets with n8n](https://learn.ynteractive.com/content/ai-receipt-extractor-n8n-google-sheets) (module 1 of Business Automations) **In the course:** [Part 9 · n8n Automation Toolkit](https://learn.ynteractive.com/content/course/part-9-n8n-automation-toolkit) (Module 76 of the [full course](https://learn.ynteractive.com/content/course)) **Part of:** [Email on Autopilot](https://learn.ynteractive.com/content/paths/email-on-autopilot) (step 9 of 17). Next up: [n8n: Weekly Client Status Emails from a Google Sheet, Written by AI](https://learn.ynteractive.com/content/weekly-client-status-email-google-sheets-ai-n8n) **Part of:** [Business Automations with n8n](https://learn.ynteractive.com/content/paths/business-automations-n8n) (step 4 of 22). Next up: [n8n: Turn Meeting Notes into Action Items in a Google Sheet](https://learn.ynteractive.com/content/meeting-notes-to-action-items-google-sheets-ai-n8n) **Part of:** [n8n Intermediate: Real Business Workflows](https://learn.ynteractive.com/content/paths/n8n-intermediate) (step 11 of 17). Next up: [n8n: Weekly Client Status Emails from a Google Sheet, Written by AI](https://learn.ynteractive.com/content/weekly-client-status-email-google-sheets-ai-n8n) ## Watch the 30-second version 3 short videos from this lesson. Watch, then do it yourself in the free practice copy. ### The error everyone gets Short with Robert · 0:18 You built your first AI agent, you click run, and it's red: "No session ID found." Don't panic, everybody gets this one. The memory wants a chat ID and an email doesn't have one, so give it the email's thread ID. ### Myth: AI emails customers on its own Short with Robert · 0:19 Myth: an AI agent will email your customers without asking you. Fact: only if you set it up that way. In our lesson the Gmail tool says Send, and we change it to Draft. Now the worst it can do is write a draft you… **Transcript** Myth: an AI agent will email your customers without asking you. Fact: only if you set it up that way. In our lesson the Gmail tool says Send, and we change it to Draft. Now the worst it can do is write a draft you never send. ### Same email, 20 times a day? Short with Robert · 0:14 Answering the same email 20 times a day? An AI reads the email and drafts the reply from your info. You read the draft and hit send. You're still in charge, not the AI. ## What you will build You play the office at Greenline Pest Control, a family-run company. A customer, Dana, writes in: ants in the kitchen, does Greenline cover Maple Grove, and roughly what does a treatment cost? You build a workflow that answers emails like hers automatically. A Gmail Trigger watches the inbox. An [AI Agent](https://learn.ynteractive.com/content/n8n-ai-agent-tutorial-google-sheets) reads the sender, subject and message. It knows Greenline's real service areas (Maple Grove, Cedar Falls and Brookside), prices ($149 for a first general pest visit, $89 for a follow-up) and booking hours, and it uses a Gmail tool to save a reply as a draft right under the customer's email. At the end, Dana's draft says yes to Maple Grove, gives the right price and asks for her address and two times that work. ## Who this is for This module is for service businesses that get the same questions every day: pest control, cleaning, landscaping, home repair, salons and more. If your inbox is full of "do you cover my area?" and "how much does it cost?", this is built for you. To run the model you need either n8n's free [credits](https://learn.ynteractive.com/content/glossary/ai-credits) or an OpenAI key; the n8n [AI agent](https://learn.ynteractive.com/content/glossary/ai-agent) lesson shows how to make a key. It is also a good fit if you are nervous about letting AI talk to customers. Nothing leaves your inbox without you. The agent does the first draft, and you keep the final say on every reply. ## What you need before you build it for real Four things, all free to start. 1) An n8n account: n8n Cloud has a free trial, so sign up at n8n.io. 2) The Gmail inbox customers write to, because n8n asks you to sign in with Google and allow access. 3) A model to power the agent. New n8n accounts come with free credits: in the OpenAI Chat Model node, open the Credential list and pick Gateway credits. If you would rather use your own OpenAI key, the free n8n AI agent lesson walks through making one, step by step. 4) A test email. Send yourself a message from a different address, such as a second Gmail, so the Gmail Trigger has something to fetch. The practice copy here needs none of this. Do it here first, then repeat the same clicks in your own n8n. ## The error you fix, and why it matters The first test fails on purpose. Simple Memory expects a chat session ID, and an email is not a chat, so there is nothing to tell conversations apart. Many people fix this by deleting the memory node. The lesson shows a better fix: define the session key yourself using the thread ID. Every email conversation has its own thread, so memory now keeps one conversation per customer. Seeing a real error and reading what it means is one of the most useful skills in n8n. ## Why drafts, not sent emails Setting the Gmail tool to Draft means the worst the agent can do is write something you never send. That makes it safe to switch on for a real business on day one. The system message adds a second guard: if the agent does not know something, it says someone from the team will follow up, instead of guessing a price or date. Plain text is used on purpose too, because it reads more like a person than a formatted template. ## How to use this in your business Swap Greenline's facts for yours: your towns, your prices, your hours and how customers book. Keep the rules section as it is. Each morning you open Gmail and find replies already written under each new question. Read, tweak if needed, and send. Most replies take seconds instead of minutes, and customers hear back faster. Keep the "What you know" list honest and current. When a price changes or you add a town, update the system message and every future draft follows. If you notice the agent handing off the same question again and again, that is a sign to add the answer to its facts. ## How the practice works Each step is shown on the left under Watch, then you do it on the right under Your turn, in practice copies of n8n and Gmail. Every click is checked, and Do it for me finishes a step if you get stuck. No Gmail account is connected and no email is read or sent. ## Try it yourself, free Reading the steps is a start. Doing them is how it sticks. The interactive module walks you through every click in a practice copy of n8n, checks each step, and never touches your real accounts. [Start “n8n AI Email Responder: Draft Gmail Replies Automatically”](https://learn.ynteractive.com/modules/email-responder) ## Step by step: n8n AI Email Responder: Draft Gmail Replies Automatically All 68 steps of the interactive module, in order. In the module you watch each one, then do it yourself in a practice copy that checks your work. ### 1. The email 1. **Look at the inbox.** You're the office at Greenline Pest Control. Switch to the **Gmail** tab. In this module you're the office at Greenline Pest Control, and customers email the same questions all day. Do you cover my area? What does it cost? Let's build an agent that writes those replies for you. First, look at the inbox. Switch to the Gmail tab. 2. **Open the email.** Open Dana's email. There's a new one from Dana. 3. **Back to n8n.** Ants, an area and a price question. Switch back to **n8n**. Ants in the kitchen, is Maple Grove covered, and roughly what does it cost. A person could answer that in two minutes. The agent will do it in seconds. Back to the n8n tab. ### 2. Gmail trigger 4. **Create a workflow.** Click **Create workflow**. 5. **Add the trigger.** Click **Add first step**. Every workflow starts with a trigger, the event that kicks everything off. Here, that's a new email arriving. 6. **Search for Gmail.** Type **gmail**. 7. **Gmail.** Click **Gmail**. 8. **On message received.** Under **Triggers**, click **On message received**. Under triggers, click on message received. That adds the Gmail trigger. ### 3. Connect Gmail 9. **Credential.** Open the **Credential** dropdown. n8n needs permission to read the inbox. 10. **New credential.** Click **Create new credential**. Create new credential. 11. **Sign in with Google.** Click **Sign in with Google**. Leave it on managed OAuth and click sign in with Google. 12. **Pick the inbox.** Pick the business inbox, **office@greenlinepest.com**. Pick the inbox customers write to. For Greenline, that is the office account. 13. **Allow access.** Click **Continue**. Google spells out what n8n can do with your mail. That list sounds big. What actually happens is decided by the nodes you add, and ours will only read and write drafts. 14. **Fetch a test email.** Leave **Every Minute** and **Message Received** as they are. Click **Fetch Test Event**. In your own Gmail, first send yourself a test email from a different address. Look at the settings. It checks every minute, and it fires on message received. Both are what we want. n8n grabs the newest email so we can see what it looks like. In your own Gmail, send yourself a test email from a different address first, so there is something to fetch. ### 4. Gmail trigger 15. **Close the node.** There's Dana's email as data: From, Subject, snippet and a threadId. Close the node. There's Dana's email, broken into fields. From, subject, a snippet of the message, and a thread I D. Think of it as one row in a spreadsheet. We'll use these fields next. Close it. ### 5. AI Agent 16. **Add the next step.** Click the **+** after the Gmail Trigger. Now, what should happen with that email. 17. **Search for the agent.** Type **agent**. 18. **AI Agent.** Click **AI Agent**. AI Agent. 19. **Change the prompt source.** Open **Source for Prompt**. This is the part people miss. By default the agent expects a chat message, but our input is an email. 20. **Define below.** Choose **Define below**. Define below. Now we write the prompt ourselves. 21. **Switch to Expression.** Above the **Prompt (User Message)** box, click **Expression**. Pasted **{{ }}** only works in Expression mode. One small switch first. Above the prompt box it says fixed and expression. If you skip this, n8n treats the curly brackets as plain text and the agent never sees the email. 22. **Write the prompt.** Click in the box and paste the prompt. The parts in **{{ }}** pull in fields from the email. It tells the agent to write a reply and save it as a draft in the same thread. The bits in double curly brackets are expressions. Each one pulls in a field from the email. Who it's from, the subject, and the message. On the left you can see those same fields from the test email. ```text Write a reply to this email, then save it as a draft in the same thread. From: {{ $json.From }} Subject: {{ $json.Subject }} Message: {{ $json.snippet }} ``` 23. **Close the node.** We'll add the business details later. Close the agent. The agent knows what to do with each email. It doesn't know anything about the business yet. We'll come back for that. Close it. ### 6. Chat model 24. **Add the model.** Click the **+** under **Chat Model**. Give it a brain. 25. **Search for OpenAI.** Type **openai**. 26. **OpenAI Chat Model.** Click **OpenAI Chat Model**. OpenAI chat model. 27. **Credential.** Open the **Credential** dropdown. 28. **Reuse your OpenAI key.** Choose **OpenAI account**, your OpenAI key. No key yet? Pick **Gateway credits** instead. n8n gives every new account free credits, and that is plenty for this. Pick OpenAI account, the key you made for n8n. If you have no key yet, pick gateway credits instead. n8n gives every new account free credits, and a few test emails cost almost nothing. The default model is fine. Writing a short email is an easy job. 29. **Close the node.** Close the model. Close it. ### 7. Draft tool 30. **Add a tool.** Click the **+** under **Tool**. Now the tool that lets the agent act on its answer. 31. **Search for Gmail.** Type **gmail**. 32. **Gmail Tool.** Click **Gmail Tool**. Gmail tool. 33. **Credential.** Open the **Credential** dropdown. 34. **Same Gmail account.** Choose **Gmail account**, the one you just connected. Pick Gmail account. It's the one you just connected for the trigger. No need to sign in again. 35. **Resource.** Open the **Resource** dropdown. It says Message. Careful here. It's set to message, and the operation is send. We do not want an agent sending emails on its own. 36. **Draft.** Choose **Draft**. Operation switches to **Create**. Draft. The operation switches to create. So the worst this agent can do is write a draft you never send. 37. **Subject: Expression.** Point at **Subject** and click **Expression** above the box. Next, the subject. It will use a field from the email, so point at subject and click expression first. 38. **Keep the subject.** Click in **Subject** and paste **Re: {{ $json.Subject }}**. Subject. A reply keeps the original subject with R E in front, or Gmail may not keep it in the same conversation. It's R E, then the subject from the email. 39. **Let the model write the message.** Next to **Message**, click the ✦ button. The message is the part we can't know ahead of time. The agent writes it. Email type stays on text, because plain text reads more like a person than fancy formatting. 40. **Add an option.** Click **Add option**. One more thing, and it's important. Without it, the draft lands as a brand new email instead of a reply. 41. **Thread ID.** Choose **Thread ID**. Thread I D. 42. **Thread ID: Expression.** Point at **Thread ID** and click **Expression**. Same trick. Point at thread I D and click expression. 43. **Point it at the thread.** Click in **Thread ID** and paste **{{ $json.threadId }}**. It's the thread I D from the Gmail trigger, so the draft sits right under Dana's email, as a reply. 44. **One more option.** Click **Add option** again. One more. The thread I D puts the draft in the right conversation, but it doesn't fill in who it goes to. Without a recipient, you couldn't just hit send. 45. **To Email.** Choose **To Email**. To email. 46. **To Email: Expression.** Point at **To Email** and click **Expression**. 47. **Reply to the sender.** Click in **To Email** and paste **{{ $json.From }}**. It's the from field of the email, so the reply goes back to whoever wrote in. 48. **Close the node.** Close the tool. Tool's done. Close it. ### 8. Memory 49. **Add memory.** Click the **+** under **Memory**. Last part: memory. If Dana writes back, the agent should remember what it already told her. 50. **Simple Memory.** Click **Simple Memory**. Simple memory. 51. **Close the node.** Leave the defaults for now. Close it. Leave the defaults for now and close it. Keep an eye on this one. ### 9. Instructions 52. **Open the agent.** Double-click **AI Agent**. Now the business details. Without them the agent will guess prices, and that's how you end up promising something you don't do. Double click the AI agent. 53. **Add an option.** Click **Add Option**. Add option. 54. **System Message.** Choose **System Message**. System message. 55. **Give it the facts.** It starts with **You are a helpful assistant**. Click in the box, select all of it, and paste the system message over it: role, what it knows, rules, and style. It already says, you are a helpful assistant. It has four parts. The role. What it knows, meaning the service areas, prices and hours. The rules: it can only make drafts, and if it doesn't know something it says someone will follow up, never makes it up. And the style: friendly, short, plain text. Swap in your own details and this works for any business. ```text Who you are: You write email replies for Greenline Pest Control, a family-run pest control company. What you know: - We service Maple Grove, Cedar Falls and Brookside. - General pest treatment (ants, spiders, roaches): $149 for the first visit, $89 for a follow-up. - We book Monday to Saturday, 8am to 5pm. - To book, the customer replies with their address and two times that work. Rules: You cannot send email. You can only create drafts. If you don't know something, say someone from the team will follow up. Never make up prices, dates or services. How to write: Friendly, plain and short. Plain text, not HTML. Sign off as "The Greenline team". ``` 56. **Close the node.** Close the agent. That's everything. Close it. ### 10. Test and fix 57. **Test it.** Click the orange **Execute** button at the bottom of the canvas. Time to test. It runs on Dana's email. 58. **Open the memory.** It failed: **No session ID found** in Simple Memory. Double-click the red **Simple Memory** node. Red. Error in sub-node simple memory, no session I D found. Don't worry, this happens to everyone the first time. Double click the red memory node and let's see why. 59. **Find the problem.** It's looking for a chat session ID, and emails don't have one. Open **Session ID**. Here's the problem. Memory is looking for a chat session I D, and it comes back undefined, because an email is not a chat. It needs something else to tell conversations apart. 60. **Define below.** Choose **Define below**. Define below. 61. **Key: Expression.** A new **Key** box appears. Point at it and click **Expression**. A key box appears. Point at it and click expression. 62. **Use the thread.** Click in **Key** and paste **{{ $json.threadId }}**. Every email conversation has its own thread, so now memory keeps one conversation per customer. That's actually better than just deleting the memory, which is the quick fix you'll see a lot of people use. 63. **Close the node.** Close it. 64. **Test again.** Click **Execute** again. ### 11. Check the draft 65. **Check Gmail.** Everything is green. Switch to the **Gmail** tab. All green. Switch to Gmail and see what it wrote. 66. **Read the draft, then go back.** The draft sits under Dana's email. Right area, right prices, not sent. Switch back to **n8n**. There it is, a draft, right under Dana's email. Yes to Maple Grove, a hundred forty nine for the first visit, and it asks for her address and two times, exactly like we told it. And it has not been sent. You read it, then you hit send. Now go back to n8n. 67. **Turn it on.** Click **Publish**. Last step. Right now it only runs when you press execute. 68. **Publish it.** Leave the version name as it is. Click **Publish**. n8n asks for a version name. The default is fine. Every new email gets a draft waiting for you. ## More videos from this lesson ### AI Email Responder with n8n: the 1-minute version Highlight · 1:06 · with captions Build an n8n agent that watches your Gmail, reads each new customer email, and writes a reply as a draft in the same thread, ready for you to check and send. Try it free, one click at a time: https://learn.ynteractive.com/modules/email-responder More free AI automation walkthroughs: https://learn.ynteractive.com ### AI Email Responder in n8n, step by step Short · 0:42 · with captions Build an n8n agent that watches Gmail, reads each new customer email, and writes a reply as a draft in the same thread, ready for you to check and send. Build it yourself, free, one click at a time: learn.ynteractive.com ### Make AI drafts land in the right thread Short · 0:39 · with captions Build an n8n agent that watches Gmail, reads each new customer email, and writes a reply as a draft in the same thread, ready for you to check and send. Build it yourself, free, one click at a time: learn.ynteractive.com ### n8n AI Agent: Stop your AI from guessing prices Short · 0:35 · with captions n8n AI Agent tip: Stop your AI from guessing prices Build an n8n agent that watches Gmail, reads each new customer email, and writes a reply as a draft in the same thread, ready for you to check and send. Build it yourself, free, one click at a time: learn.ynteractive.com [All free Stepthrough videos](https://learn.ynteractive.com/content/videos) ## Frequently asked questions **Will the AI send emails without my approval?** No. The Gmail tool is set to create drafts only, and the system message says it cannot send email. You read each draft and send it yourself. **Is this course really free?** Yes. Stepthrough is completely free, and the practice copy needs no accounts. To build it for real you need your own n8n, OpenAI and Google accounts, and some of those cost money once you use them for real work. **How do I fix "No session ID found" in n8n Simple Memory?** Open the Simple Memory node, set Session ID to Define below, and use an expression that is unique per conversation. For email, the lesson uses the Gmail thread ID. **How does the draft end up in the same email thread?** The Gmail tool's Thread ID option is set to the threadId from the Gmail Trigger, so the draft is saved as a reply in that conversation. **Do I need an OpenAI account for this?** Not necessarily. New n8n accounts include free model credits: in the OpenAI Chat Model node choose Gateway credits in the Credential list. You can also create your own OpenAI key, which the n8n AI agent lesson shows step by step. **How often does it check for new email?** The Gmail Trigger in the lesson polls every minute once the workflow is published. **Can it draft replies to unanswered email threads already in my inbox?** The lesson's workflow drafts a reply to each new email as it arrives, in the same thread. To catch threads that are already waiting, a variation not covered in the lesson: swap the Gmail Trigger for a Schedule Trigger and a Gmail step that gets many messages with a search such as in:inbox is:unread, then send each one to the same agent. Gmail has no search for "unanswered", so check the list before you rely on it. [Start this module free](https://learn.ynteractive.com/modules/email-responder) - Previous in Business Automations: [AI Receipt Extractor: Receipts to Google Sheets with n8n](https://learn.ynteractive.com/content/ai-receipt-extractor-n8n-google-sheets) - Next in Business Automations: [Daily Job Alerts: Email Each Tech Their Jobs from Google Sheets with n8n](https://learn.ynteractive.com/content/n8n-daily-job-alerts-google-sheets-gmail) ## More in Business Automations - [Gmail AI Triage: Auto-Label Every Email and Draft Replies](https://learn.ynteractive.com/content/gmail-ai-triage-labels-drafts-n8n): Build an n8n workflow that reads each new email, sorts it as a lead, a client or an invoice with a Text Classifier, adds the matching Gmail label, and drafts a reply to… - [A Support Agent That Answers from Your Own Docs](https://learn.ynteractive.com/content/support-agent-answers-from-your-docs-n8n): Turn an n8n chat agent into a support agent that answers only from your policies in a Google Doc, refuses what it should, and hands off to a person by email. [All 34 modules in Business Automations](https://learn.ynteractive.com/content/course/business-automations) ## More n8n tutorials - [n8n AI Agent Tutorial: Save Social Media Ideas to Google Sheets](https://learn.ynteractive.com/content/n8n-ai-agent-tutorial-google-sheets): Build an AI agent for BrightPath Marketing that generates social media post ideas and saves them to Google Sheets — chat trigger, AI Agent, system prompt, model… - [Lovable + n8n: Build a Web App with an AI Backend](https://learn.ynteractive.com/content/lovable-n8n-web-app-ai-backend): Build a contact form in Lovable and connect it to an n8n workflow — webhook trigger, AI Agent, Google Sheets, Gmail, and a Respond node that ties it all together. - [Build an AI Follow-Up Agent for HVAC Service Calls](https://learn.ynteractive.com/content/hvac-service-follow-up-ai-agent-n8n): Build an AI agent for Cedar Ridge Heating & Air that writes follow-up messages for completed service calls and saves them to Google Sheets — chat trigger, AI Agent… - [Build an AI Service Request Form for Your HVAC Company](https://learn.ynteractive.com/content/hvac-service-request-form-ai-lovable-n8n): Build a service request form in Lovable for Cedar Ridge Heating & Air and connect it to n8n — the AI agent sorts each job into repair, maintenance, install or… - [Build an AI Job Follow-Up Agent for Electricians](https://learn.ynteractive.com/content/electrician-job-follow-up-ai-agent-n8n): Build an AI agent for Oak & Wire Electric that writes follow-up messages after completed jobs and tracks them in Google Sheets — chat trigger, AI Agent, system prompt… - [Build an AI Quote Request Form for Electrical Contractors](https://learn.ynteractive.com/content/electrical-quote-request-form-ai-lovable-n8n): Build a quote request form in Lovable and connect it to an n8n workflow — webhook trigger, an AI Agent that drafts an initial estimate note, Google Sheets, Gmail, and a… ## From the blog - [n8n AI Agent Tools: How the Agent Gets Things Done](https://learn.ynteractive.com/content/blog/n8n-ai-agent-tools): n8n AI agent tools explained: Google Sheets Tool and Gmail Tool vs regular nodes, naming tools in the system message, and limiting a tool to drafts. - [What Is JSON in n8n? A Plain-English Guide](https://learn.ynteractive.com/content/blog/what-is-json): What is JSON in n8n? Keys and values, how a form sends JSON, why webhooks use $json.body.name but Gmail uses $json.Subject, and why keys must match. - [n8n Node Warnings and Errors: What the Red Means](https://learn.ynteractive.com/content/blog/n8n-warnings-and-red-nodes): n8n node warnings and errors explained: template warnings, the red triangle on an AI Agent, "Error in sub-node", green checks and item counts. [All blog posts](https://learn.ynteractive.com/content/blog) ## Visual guides This lesson’s key ideas as quick visual guides: swipe through the slides, or read the same guide as text. - [Automate Email Responses with AI: Drafts-Only System Message](https://learn.ynteractive.com/content/visual/email-agent-system-message): Automate email responses with generative AI without auto-sending: the system message from the AI Email Responder lesson that answers FAQs as drafts. - [5 Steps to an AI Email Responder That Only Writes Drafts](https://learn.ynteractive.com/content/visual/5-steps-ai-email-responder-drafts): A visual guide: an n8n agent reads each new Gmail message and saves a reply as a draft in the same thread. You read it and click Send. - [Myth: Telling an AI Agent Not to Send Email Is Enough](https://learn.ynteractive.com/content/visual/myth-tell-the-agent-not-to-send): Myth vs fact: a "drafts only" rule in the system prompt helps, but choosing the Draft resource in the Gmail tool is what makes sending impossible. [All visual guides](https://learn.ynteractive.com/content/visual) ## Free cheat sheets Print it or save the PDF: the key steps and checks from this lesson on one page, free. - [AI Email Responder in n8n Cheat Sheet](https://learn.ynteractive.com/content/cheat-sheets/ai-email-responder-n8n): A free one-page cheat sheet: n8n watches Gmail, an AI agent reads each customer email and saves a reply as a draft in the same thread. - [AI Email Drafts Safety Cheat Sheet](https://learn.ynteractive.com/content/cheat-sheets/ai-email-drafts-safety): A free one-page cheat sheet: let AI write email drafts, not sends. Give it facts and rules, keep private data out and check every promise. - [Check Every Promise in an AI Reply: Cheat Sheet](https://learn.ynteractive.com/content/cheat-sheets/check-every-promise): A free one-page cheat sheet: give ChatGPT the thread and your numbered facts, ask for a promise-by-promise table, fix what it flags, then send. [All free printable cheat sheets](https://learn.ynteractive.com/content/cheat-sheets) ## Terms in this lesson Plain-English definitions, each with an example from a free lesson. [Action](https://learn.ynteractive.com/content/glossary/action) · [Agent memory](https://learn.ynteractive.com/content/glossary/agent-memory) · [AI Agent node](https://learn.ynteractive.com/content/glossary/ai-agent-node) · [Artificial intelligence (AI)](https://learn.ynteractive.com/content/glossary/artificial-intelligence) · [Delimiters](https://learn.ynteractive.com/content/glossary/delimiters) · [Employee handbook](https://learn.ynteractive.com/content/glossary/employee-handbook) · [Execution](https://learn.ynteractive.com/content/glossary/execution) · [AI agent](https://learn.ynteractive.com/content/glossary/ai-agent) [The full AI glossary](https://learn.ynteractive.com/content/glossary) ## Related prompts - [AI agent system message prompt](https://learn.ynteractive.com/content/prompts/agent-system-message-draft-prompt): An AI agent prompt template for the n8n System Message: who the agent is, what it knows, its rules and how it writes, plus a… - [Daily priorities plan prompt](https://learn.ynteractive.com/content/prompts/daily-priorities-plan-prompt): Paste your to-do list and fixed times and get a realistic plan for today: top three, time blocks, a buffer, and what to move to… - ["Do you service my area?" reply prompt](https://learn.ynteractive.com/content/prompts/service-area-question-reply-prompt): Answer "do you cover my town?" from your real service area list: a clear yes with how to book, a kind no, or a request for the… - [FAQ from customer emails prompt](https://learn.ynteractive.com/content/prompts/faq-from-customer-emails-prompt): Turn a batch of customer emails into an FAQ: the questions people really ask, in their words, answered only from your facts… [All free prompt templates](https://learn.ynteractive.com/content/prompts) ## More terms on this topic AI email assistant · [Cron expression](https://learn.ynteractive.com/content/glossary/cron-expression) · [HTTP status code](https://learn.ynteractive.com/content/glossary/http-status-code) · Jailbreak · Model router · [Natural language processing (NLP)](https://learn.ynteractive.com/content/glossary/natural-language-processing) · Rate limit · Service area ## More prompts on this topic - [Declined card notice prompt](https://learn.ynteractive.com/content/prompts/card-declined-notice-prompt): Tell a customer their card was declined without embarrassing them: what failed, the amount, a safe way to update it and what… - [FAQ-based customer reply prompt](https://learn.ynteractive.com/content/prompts/customer-question-faq-reply-prompt): A copy-ready prompt that answers a customer question using only your FAQ text, so ChatGPT cannot invent policies. Includes a… - ["How much does it cost?" reply prompt](https://learn.ynteractive.com/content/prompts/first-visit-price-question-reply-prompt): Answer a price question using only your published prices: what the first visit costs, what it includes, what changes the price… - [Job post prompt](https://learn.ynteractive.com/content/prompts/job-post-prompt): A four-part ChatGPT prompt for a job ad people want to read: real pay and schedule, must-haves kept apart from nice-to-haves… - [Technician on the way text prompt](https://learn.ynteractive.com/content/prompts/technician-on-the-way-text-prompt): Write the "your tech is on the way" text: who's coming, the arrival estimate dispatch gave you, what to have ready, and how to… - [Upsell offer email prompt](https://learn.ynteractive.com/content/prompts/upsell-offer-email-prompt): Offer an existing customer one related service that fits what they bought or told you, with your real price, the reason it fits… ## Browse related tutorials [Business Automations (34)](https://learn.ynteractive.com/content/course/business-automations) · [n8n tutorials (56)](https://learn.ynteractive.com/content/tool/n8n)