The present invention is related to a software system that solves the above-mentioned problems. In accordance with one embodiment of the invention, a computerized subscriber list creation and management system for use on the internet or other network is described. In a preferred embodiment of the invention, a business may conduct advanced database search queries, then save, manage and update those searches automatically. A business may build subscriber lists using multi-part rules determined by customer data including demographics, preferences, and behaviors. Moreover, the business may save the searches and manage database segments effectively for use in multiple campaigns. Subscriber lists update automatically as the database grows and changes.