The disclosed system provides blocking of incoming messages that are intended to be received on a mobile device of a user who is operating a vehicle. When an incoming message is received, the disclosed system retrieves driving status information for the destination mobile device to determine whether it is in a vehicle that is being driven. If the destination mobile device is in a vehicle that is being driven, the system blocks message delivery to the recipient and places the incoming message in a holding queue. The system may notify the sender that the incoming message has been blocked. If the destination mobile device is not in a vehicle that is being driven, the system delivers the incoming message to the destination mobile device along with any messages in the holding queue. The system optionally notifies the sender that the incoming message and/or the previously queued messages have been delivered.