1. A network device to manage a delivery of a message over a network, comprising: a transceiver to send and receive data over a network; and a processor that is operative to perform actions, comprising: receiving a message over the network for at least a first user account; providing the message to a plurality of global classifiers, wherein each of the global classifiers is associated with user accounts other than the first user account; providing the message to a local classifier associated with the first user account; receiving a message prediction from each of the plurality of global classifiers and the local classifier; combining the message predictions from each of the plurality of global classifiers with the local classifier to determine a single message classification as to if the message is a spam message for the first user account; and selectively directing the message to the first user account based on the determined single message classification.