A system is described for communicating with a mobile device. The mobile device exchanges an electronic message with a messaging server, where the message is encrypted with a messaging key. The mobile device encrypts a copy of the message with a monitoring key different from the messaging key, and sends the encrypted copy to a monitoring server remote from the messaging server. The mobile device communicates with the messaging server via a network router. The network router is configured to block transmission of an encrypted electronic message between the mobile device and the messaging server when an access condition is not met.