This plugin redirects a site's outgoing email from the default PHP mail function to a specified external SMTP server. It is for administrators who need more reliable email delivery, such as for notifications or contact forms.

Configuration in wp-config.php: SMTP server credentials (host, port, encryption, username, password) are defined directly in the main configuration file, not in a plugin settings panel.

Centralized settings for multisite: On multisite installations, the configuration placed in the network's main wp-config.php file applies to all sites, avoiding repetitive setup.

Enhanced security: Because settings are stored in the configuration file, they are not accessible or readable through the site's admin interface, reducing exposure.

Custom from and reply-to addresses: Allows defining specific sender and reply-to email addresses for all emails sent from the site.

Configuration testing: Provides a dedicated settings page to test the SMTP connection and confirm the setup is working correctly.