A method and system for detecting and preventing bulk messages in real-time is provided. A detection server detects and prevents bulk messages in real-time by analyzing the network traffic pattern of attributes of messages, such as email messages, that are passing through the network against an expected network traffic pattern. The expected network traffic pattern may be specified as a combination of a rate and one or more thresholds, where each threshold has a corresponding status. The rate specifies a quantity of an attribute measured with respect to a quantity of time. A status associated with a threshold is attained when the rate is exceeded the requisite threshold number of times. The status indicates an action that is to be taken in processing the email message containing the attribute. An email message can then be processed in accordance with a status assigned to an attribute of the email message.