PHP - PHPMailer

<?php

use PHPMailer\PHPMailer\PHPMailer;

use PHPMailer\PHPMailer\Exception;

require 'Phpmailer/Exception.php';

require 'Phpmailer/PHPMailer.php';

require 'Phpmailer/SMTP.php';

// Instantiation and passing `true` enables exceptions

$mail = new PHPMailer(true);

try {

    //Server settings

    $mail->SMTPDebug = 0;                                       // Enable verbose debug output

    $mail->isSMTP();                                            // Set mailer to use SMTP

    $mail->Host       = 'smtp.gmail.com';  // Specify main and backup SMTP servers

    $mail->SMTPAuth   = true;                                   // Enable SMTP authentication

    $mail->Username   = '@gmail.com';                     // SMTP username

    $mail->Password   = 'mipassword';                               // SMTP password

    $mail->SMTPSecure = 'tls';                                  // Enable TLS encryption, `ssl` also accepted

    $mail->Port       = '587';                                    // TCP port to connect to

    //Recipients

    $mail->setFrom('@gmail.com', '');

    $mail->addAddress('@gmail.com', '');     // Add a recipient

    // Content

    $mail->isHTML(true);                                  // Set email format to HTML

    $mail->Subject = 'Este es un correo de prueba';

    $mail->Body    = 'Mi mensaje de prueba <b>in bold!</b>';

    $mail->send();

    echo 'Message enviado correctamente';

} catch (Exception $e) {

    echo "Message  Error: {$mail->ErrorInfo}";

}

mail($destino, $asunto, $mensaje);