About this plugin
0 authentication. No SMTP passwords, no fragile basic auth. Just connect your Microsoft account once and your transactional emails will be sent reliably from your real mailbox, dramatically improving deliverability and helping you stay compliant with Microsoft’s modern authentication requirements (after the deprecation of basic auth / SMTP AUTH).
If you want a simple, secure way to fix WordPress email delivery using your Microsoft 365 / Outlook mailbox, Web357 Mail Connect for Microsoft Outlook 365 is for you.
Full setup, Azure app registration, and troubleshooting steps are in the official documentation.
External services
0 and the Microsoft Graph API. It requires an Azure / Microsoft Entra ID app registration that you create and control.
com ) is used to authorize the plugin against your Microsoft account and to exchange/refresh the resulting access token. When you click “Connect” in the Configuration tab, and again automatically whenever a stored access token expires, the plugin sends your app’s Client ID, Client Secret, Tenant ID, redirect URI, and the OAuth authorization code or refresh token, and receives back an access token and refresh token in return.
com/en-us/servicesagreement/. com/en-us/privacystatement
com ) is used to (1) read the connected account’s email address right after you authorize, and (2) send every outgoing email (the message subject, HTML/text body, recipient addresses, headers, and attachments) using your connected mailbox’s identity. This happens every time WordPress (or any plugin using wp_mail() ) sends an email, and when you use the built-in Test Email tool.
com/en-us/legal/microsoft-apis/terms-of-use. com/en-us/privacystatement
No data is sent to Microsoft until you complete the OAuth connection yourself.
Basic Features
- OAuth 2.0 authentication via Microsoft Graph: connect your Microsoft 365 / Outlook / Exchange Online account in one click, no app passwords required.
- Reroute every wp_mail() call through the Microsoft Graph API for reliable delivery and improved inbox placement.
- Compatible with Microsoft’s modern authentication: works after the deprecation of basic auth / SMTP AUTH for Exchange Online.
- Multi-tenant support: connect a Private-only tenant via Tenant ID, or leave it blank for Multi-tenant apps.
- Test Email tool: send a real test email from the WordPress admin to verify your setup before going live.
- One-click revoke: disconnect and delete the stored access key whenever you want.
- Compatible with WooCommerce, Contact Form 7, WPForms, Fluent Forms, Gravity Forms, MemberPress, LearnDash, and any plugin that uses wp_mail().
- Translation-ready and works on any modern WordPress theme.
PRO Features
Upgrade to the Premium version to unlock:
- Mail Log: view every sent, failed, and staged email with full headers, content preview, status, and timestamps. See the Mail Log documentation.
- Mail Staging Mode: log emails to the database instead of sending them, perfect for staging and development environments.
- Mail Throttle: limit how many emails per minute leave your site to avoid hitting Microsoft Graph rate limits.
- Send BCC: automatically send a blind copy of every outgoing email to an internal address (great for record-keeping and compliance).
- Default Reply-To: set a global reply-to address for all outgoing emails when one isn’t already specified by the form or plugin.
- Send from a shared mailbox: override the From address with a shared mailbox or a mailbox you have “Send As” permission on, plus an allow-list of additional From addresses. See the Send As guide.
- Priority support and ongoing updates.
Staging, throttle, BCC, Reply-To, and allowed From addresses are covered in the Advanced Configuration documentation.