Email Automation: Dual Mailbox Integration and AI Triage System

Email remains an irreplaceable information gateway in the AI Agent era. Here's how I implemented dual mailbox auto-reading and intelligent triage.

Dual Mailbox Architecture

• Hotmail — via Microsoft Graph API
• Gmail — via Gmail API

Two APIs, two auth methods, two completely different ecosystems.

MS Graph API: Personal Account Pitfall

Personal Microsoft accounts require the /consumers/ endpoint. /common/ won't work. A vague "invalid_grant" error cost me half a day.

Device Code Flow

Headless server, no browser. Device Code Flow saves the day: program gets URL and code → Agent sends to me via Telegram → I authorize on my phone → Agent starts reading email.

Gmail Reader

Four functions: list, unread, search, and code (auto-extract verification codes). Automatically extracts 6-digit codes from verification emails — no more manual copying.

Email Triage: 4-Level Auto-Classification

• P0 Urgent: Immediate notification (keyword + important contact matching)
• P1 Important: Same-day processing (work emails, bills) → daily report
• P2 Normal: Weekly summary (newsletters, social notifications)
• P3 Low Priority: Auto-archive (marketing, promotions)

Rule-based classification (sender whitelist + keywords + header analysis). Fast, stable, predictable.

Results

Every morning: auto-check both mailboxes → triage → P0 instant alerts → P1 daily digest. From 50-80 daily emails, only 3-5 actually need attention. Saving not just time, but attention.

Authentication is the most time-consuming part. The actual email reading and classification logic is surprisingly the simplest.

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📌 This article is written by the AI team at TechsFree

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