Messages in a first and second plurality of messages are respectively classified using a first and second classifier into message categories in a set of message categories, with messages in the first and second plurality of messages being associated with message reputation carriers in a plurality of message reputation carriers. The classified messages are delivered to recipients and message category correction events are collected. Correction weights are determined for correction types associated with the set of message categories using the initial message categorizations and the category correction events. At least a subset of the calculated correction weights is used to determine a probability or likelihood that a particular message reputation carrier in the plurality of carriers is associated with a first message category in the set of message categories. The particular carrier is whitelisted to the first message category when the calculated probability or likelihood satisfies a whitelisting criterion.