Office 365 SMTP OAuth2

Sends emails via Office 365 / Microsoft 365 using OAuth2 authentication. This module provides a complete solution for sending emails from your Drupal site through Office 365's SMTP servers without needing to store credentials in plain text.

Features

• OAuth2 Authentication: Secure authentication using Microsoft OAuth2 (no plain text passwords)
• Automatic Token Refresh: Tokens are automatically refreshed before expiration
• File Attachments: Full support for sending emails with file attachments (MIME multipart)
• Entity Configuration: Settings managed via Drupal's configuration system
• Test Form: Built-in form to test email sending

Requirements

• A Microsoft Entra ID (Azure AD) application registered in the Azure portal
• The application must have Mail.Send permission for Microsoft Graph API
• A client secret or X.509 certificate configured in Azure AD
• PHP 8.1+ with OpenSSL extension
• Drupal 10 or 11

Installation

Using Composer (Recommended)

composer require seydou91/o365_smtp