How to Automate Your Daily Emails Using ChatGPT and Zapier

Stop copy-pasting. Set up a "Ghost Writer" workflow that fills your Drafts folder with ready-to-send replies — while you sleep.

We spend an average of 2.5 hours a day reading and replying to messages. That is 12 hours a week. A full workday, wasted.

Most people use ChatGPT to write emails manually. They copy the email, paste it into ChatGPT, ask for a reply, copy the reply, and paste it back into Gmail.

That is not automation. That is just copy-pasting with extra steps.

Copy pasting into ChatGPT is not true email automation

True automation means you don't even open Gmail until the draft is ready. Here is how to set up a "Ghost Writer" workflow using Zapier and OpenAI.

The Stack You Need

Connect Gmail, Zapier, and OpenAI workflow

Gmail — The Inbox
OpenAI API Key — The Brain
Zapier — The Glue that connects them

The Golden Rule: "Draft, Never Send"

Always save AI generated emails as drafts, never auto-send

Before we start, a warning: Never set an AI to auto-send emails.

AI hallucinates. If a client asks for a refund and the AI replies, "Sure, here is $1,000," you are in trouble.

Always set the automation to create a Draft. You simply review it and hit send.

The Workflow (Step-by-Step)

Step 1: The Trigger (Gmail)

Go to Zapier and create a new Zap.

App: Gmail
Event: New Email
Filter: Do not trigger on every email. Set a filter for specific labels (like "Client" or "Inquiry"). You don't need ChatGPT replying to your grandmother.

Step 2: The Brain (OpenAI)

Add the next step in Zapier.

App: ChatGPT (OpenAI)
Event: Conversation / Completion
Prompt: This is where the magic happens.
- System Prompt: "You are a helpful assistant. Reply to this email professionally but briefly. Keep it under 100 words."
- User Message: Insert the [Body] of the email from Step 1.

Step 3: The Action (Gmail)

Add the final step.

App: Gmail
Event: Create Draft
To: [Sender Email from Step 1]
Body: [Response from Step 2]

The Result

Now, when you wake up, your "Drafts" folder is full of ready-to-go replies.

Open Draft
Read it
Hit Send

You just turned 2 hours of typing into 10 minutes of reviewing.

💡 Pro Tip: If you want to do this for free without Zapier, check out tools like Harpa AI that run directly in your browser and can handle similar automation workflows.

The Verdict

Automation isn't about being lazy; it's about being efficient. If you are typing the same "Thanks for reaching out!" email 50 times a day, you are working for the robot.

Let the robot work for you.