Update email configuration in README and enhance email handler for Microsoft 365 support

- Updated the README.md to include specific SMTP settings for Microsoft 365 and OAuth2 authentication options.
- Modified the email handler to support OAuth2 authentication for Microsoft 365, improving security and flexibility.
- Enhanced logging to provide clearer feedback on email configuration and authentication methods used.

README.md

@@ -75,12 +75,25 @@ Create a .env file and keep it out of version control. Example:
 
 ```env
 # Email
-SMTP_HOST=
+# For Microsoft 365 / Office 365:
+SMTP_HOST=smtp.office365.com
 SMTP_PORT=587
-SMTP_USER=
-SMTP_PASS=
-ADMIN_EMAIL=
-WEBSITE_NAME=365DevNet Support
+SMTP_USER=your-email@yourdomain.com
+SMTP_PASS=your-app-password
+# OR use OAuth2 (recommended for Microsoft 365):
+# OAUTH2_CLIENT_ID=your-client-id
+# OAUTH2_CLIENT_SECRET=your-client-secret
+# OAUTH2_REFRESH_TOKEN=your-refresh-token
+# OAUTH2_ACCESS_TOKEN=your-access-token (optional)
+
+# For generic SMTP or Mailcow:
+# SMTP_HOST=your-smtp-server
+# SMTP_PORT=587
+# SMTP_USER=your-username
+# SMTP_PASS=your-password
+
+ADMIN_EMAIL=your-email@yourdomain.com
+WEBSITE_NAME=
 
 # Monitoring
 UPTIME_KUMA_URL=