A computerized method of classifying a received mail item in real time. The computerized method comprises identifying a unique identifier (ID) by analyzing a new mail item from a certain sender, identifying, according to the unique ID, a matching correspondence session which is held with the certain sender, the matching correspondence session comprises a sequence of previously sent mail items, selecting a mail class from a plurality of mail classes, using a processor, the mail class is selected according to an analysis of the sequence of previously sent mail items and as a mail item that continues the sequence of previously sent mail items, and forwarding the new mail item or a visualization thereof according to the mail class.