Microsoft Exchange 365 Mailer

Extension key: ok_exchange365_mailer
Package name: oliverkroener/ok-exchange365-mailer
Version: 4.1
Language: en
Author: Oliver Kroener <https://www.oliver-kroener.de> & Contributors
License: This document is published under the Open Publication License.
Rendered: Wed, 21 Jan 2026 18:27:44 +0000

Note

Purpose: Enables TYPO3 to send emails through Microsoft Exchange 365 using Graph API instead of SMTP
Authentication: Uses OAuth 2.0 for secure token-based authentication
API Integration: Leverages Microsoft Graph API for direct email sending
Scalability: Handles high email volumes without additional infrastructure

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).

Installation

Explains how to install this extension in Composer-based and Classic TYPO3 installations.

Configuration Microsoft Entra ID

Learn how to configure Microsoft Entra ID (formerly Microsoft AD) for this extension.

Exchange Online Setup

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

Configuration

Learn how to configure this extension.

Frequently Asked Questions (FAQ)

These questions have been frequently asked.

How to get help

Learn where to get help and how to report issues you found.