Warning: mail() [function.mail]: SMTP server response: 503 This mail server
requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server. in c:\domains\losurbano.com\wwwroot\enviar.php on line 114 .
No se donde mirar la autentificación ni nada ..a ver si alguien me echa un cable, muchas gracias.