PHP (PHPMailer) SMTP

composer require phpmailer/phpmailer

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host       = 'smtp.eusend.dev';
    $mail->SMTPAuth   = true;
    $mail->Username   = 'eusend';                       // the literal string "eusend"
    $mail->Password   = getenv('EUSEND_API_KEY');       // eu_live_…
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;    // implicit TLS
    $mail->Port       = 465;

    // From must be on a domain verified in eusend
    $mail->setFrom('no-reply@yourdomain.com', 'Acme');
    $mail->addAddress('alice@example.com');

    $mail->isHTML(true);
    $mail->Subject = 'Your order has shipped';
    $mail->Body    = '<p>Order #1234 is on its way.</p>';
    $mail->AltBody = 'Order #1234 is on its way.';

    $mail->send();
} catch (Exception $e) {
    echo "Send failed: {$mail->ErrorInfo}";
}