We have approximately a dozen lists with subscriber counts in excess of 5,000, including three lists with subscribers counts of 10,000 - 16,000, and we are not experiencing problems related to the number of subscribers. I think the performance issue on very large lists involves list updates (bulk add and bulk delete jobs) with large numbers of subscribers. If you read the L-Soft literature about LISTSERV HPO (High Performance Option), it seems to indicate that the performance benefits are in the area of list updates. -- Paul Russell Senior Systems Administrator University of Notre Dame