Introduction 

What does it do? 

The Microsoft Exchange 365 Mailer extension replaces TYPO3's default SMTP mail transport with a custom transport that sends emails via the Microsoft Graph API.

Instead of configuring an SMTP server, you register an application in Microsoft Entra ID (formerly Azure AD) and authenticate using the OAuth 2.0 client credentials flow — no user interaction or stored passwords required.

Features 

  • Send emails through Microsoft Graph API — no SMTP required
  • OAuth 2.0 client credentials flow for server-to-server authentication
  • Supports both backend (environment variables / TYPO3 settings) and frontend (TypoScript) configuration
  • Compatible with Powermail, TYPO3 Form Framework, and other form extensions
  • Optional saving of sent emails to the sender's "Sent Items" folder
  • Automatic credential blinding in TYPO3's configuration module
  • Works with shared mailboxes and Application Access Policies

Requirements 

  • TYPO3: 12.4 LTS, 13.4 LTS, or 14.x
  • PHP: 8.3+

  • Dependencies:

    • microsoft/microsoft-graph ^2 — Microsoft Graph SDK
    • oliverkroener/ok-typo3-helper — provides MSGraphMailApiService for message conversion