Email Newsletter Digest (Gmail + GPT-4o)

This script automatically summarizes your email newsletters from specific senders using OpenAI’s GPT-4o and sends you a clean HTML digest once per day. Built entirely in Google Apps Script.

What It Does

• Filters unread Gmail threads from specific senders in the last 48 hours
• Uses GPT-4o-mini to summarize email content into bullet points
• Formats each summary as clean, readable HTML
• Sends a single email digest to your inbox
• Marks messages as read after processing

What You’ll Need

• A Gmail account
• An OpenAI API key
• A few minutes in the Google Apps Script editor

Setup Instructions

1. Open Google Apps Script

1. Go to https://script.google.com
2. Click + New Project
3. Name your project something like Email Newsletter Digest

2. Replace Default Code

1. Delete any starter code (like function myFunction())
2. Copy and paste the entire contents of Code.gs into the editor:
   • This includes the summarizeUnreadEmailsFromSendersLast24Hours function and helpers
3. (Optional but recommended) Create a second file named appsscript.json with:

{
  "timeZone": "America/Chicago",
  "exceptionLogging": "STACKDRIVER"
}