Microsoft Exchange 365 Mailer

Extension key: ok_exchange365_mailer
Package name: oliverkroener/ok-exchange365-mailer
Version: 4.3
Language: en
Author: Oliver Kroener <ok@oliver-kroener.de>
License: This document is published under the Open Publication License.
Rendered: Thu, 13 Aug 2026 08:14:32 +0000

A TYPO3 extension for sending emails via Microsoft Exchange 365 using the MS Graph API instead of SMTP. Uses OAuth 2.0 client credentials flow for secure, token-based authentication.

Attention

Since Q3 2025, Microsoft has enforced stricter access policies in some Exchange 365 tenants. You may need to configure an Application Access Policy to restrict app permissions to specific mailboxes. See Exchange Online Setup.

This can also be used to restrict sending to only specific sender addresses (e.g., a shared mailbox).

📖 Introduction

Learn what this extension does, its features, and system requirements.

Learn more

📦 Installation

Install the extension via Composer and activate it in your TYPO3 project.

Get started

🔑 Microsoft Entra ID Setup

Register an app in Microsoft Entra ID (formerly Azure AD) and configure API permissions for Graph API mail sending.

Configure Azure

🛡️ Exchange Online Setup

Configure Application Access Policies to restrict app permissions to specific mailboxes using PowerShell.

View guide

⚙️ Configuration

Set up the extension via environment variables, TYPO3 settings, or TypoScript for frontend form integration.

Configure

❓ FAQ

Answers to frequently asked questions about installation, configuration, and usage.

Read FAQ

✉️ Contact

Get in touch with the author for support, questions, or contributions.

Get in touch