Hi every body. We have an Exchange 2003 email server behind a firewall. We can receive emails from everybody except the emails that come from mx.e.telefonica.net. All our clients that uses this mailserver (MX) recieve the next error: "Delivery to the following recipients has been delayed." Then they receive the next error: "did not reach the following recipient(s): mayacountls@mydomain.com on Fri, 9 May 2008 19:09:14 퍭 No se pudo entregar el mensaje en el límite de tiempo especificado. Inténtelo de nuevo o póngase en contacto con el administrador del sistema. <ze3smtpout020.e.telefonica.net #4.4.7>" Best Regards,