Abstract: Systems, methods and products for increasing efficiency of resource usage by determining the reliability of reporters of unwanted messages and prioritizing evaluation of messages based on the reliability scores. Reports of unwanted messages are evaluating to determine whether they are bad. If an unwanted message is bad, a score for the reporter is updated to reflect a positive credit. A set of safe rules are applied to the message to determine whether it is safe and if the message is determined to be safe, the reporter score corresponding to the reporter is updated to reflect a non-positive (zero or negative) credit. If the message is determined to be neither bad nor safe, the message is entered in a reevaluation queue and, after a waiting period, the message evaluation is repeated using updated threat information, and the reporter score is updated according to the reevaluation.