<?php 
require_once 'PHPMailer/class.phpmailer.php';
$mail = new PHPMailer ();
$mail->From = "correo@hotmail.com";
$mail->FromName = "Remitente";
$mail->AddAddress("destinatario@XXX.com");
$mail->Subject = "Asunto";
$mail->Body = "Hola";
$mail->IsHTML (true);
$mail->IsSMTP();
$mail->Host = 'ssl://smtp.gmail.com';
$mail->Port = 465;
$mail->SMTPAuth = true;
$mail->Username = 'micorreo@gmail.com';
$mail->Password = 'mipassword';

if(!$mail->Send()) {
echo 'Error: ' . $mail->ErrorInfo;
}
else {
echo 'Mail enviado!';
}
?> 

<?php 
if($mbox = @imap_open("{imap.gmail.com:993/imap/ssl}", "user", "passw", OP_HALFOPEN))  
{
    echo "Ingresaste con exito "
} 
else
 {
    echo "error";
}
?>