SMTP Integration for WordPress Plugins

SMTP Integration for WordPress Plugins — a practical guide to WordPress SMTP with clear examples you can reuse in real projects.

WordPress Plugin Development Series (54/95). Prefer one article? Read the complete WordPress plugin development tutorial.

Short description

Hook `phpmailer_init` or integrate with an SMTP plugin/API provider. Keep credentials in protected options/env.

phpmailer_init sketch

add_action('phpmailer_init', function ($phpmailer) {
    $phpmailer->isSMTP();
    $phpmailer->Host = 'smtp.example.com';
    $phpmailer->SMTPAuth = true;
    $phpmailer->Port = 587;
    $phpmailer->Username = 'user';
    $phpmailer->Password = 'pass';
});