Hrm... maybe I'm just missing it today... but isn't there a specific option to prevent select users from actually sending mail. The users need to be able to recieve mail... but not send any. I suppose I could implement a Send Message Size limit of zero... but wanted to know if there was a better way to do it.
Exchange 2000 sp2 List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm