On-Demand Gmail Newsletter Summaries to Telegram with GPT-4o-mini

This workflow automates on-demand newsletter digests by triggering on a Telegram message containing a number of days (e.g., '2'). It fetches relevant Gmail emails since that date using a custom search query (filterable by senders), extracts subjects, senders, dates, and HTML content. Each email is then summarized by GPT-4o-mini into concise JSON topics for consistency.

Topics from all emails are merged into a single, readable enumerated digest with bold titles. The message is intelligently split into 3500-character chunks, sanitized to Telegram-safe HTML (no previews), and sent sequentially to your chat. This ensures safe, formatted delivery without exceeding limits.

Benefits include effortless daily/weekly briefings without leaving Telegram, curated feeds from specific senders, and lightweight knowledge synthesis. Ideal for personal productivity, team updates, or tracking influencers/newsletters. Requires Gmail OAuth, Telegram bot, and OpenAI credentials; highly customizable via query filters.