An electronic message processing system in which routing tags are used to determine how electronic messages are routed, distributed, or otherwise processed by the system. The association of a routing tag with an electronic message indicates to the system that the tagged electronic message does not need to undergo classification in order to determine how to process the message. In particular, routing tags are associated with electronic messages which have already been classified and which are subsequently sent out of the system to return at a later time. The routing tag prevents the message from having to be re-classified upon its return to the system. Reducing the number of messages that are classified, or re-classified, is advantageous since the classifiaction process, which typically involves text analysis, is a time consuming process.