You have two choices. If you are not using a directory catalog, and no other databases on the server need a FTI, set the notes.ini parameter "Update_No_Fulltext=1". If you need a FTI on a server, your other choice is to knock people down to Editor in the ACL of their mail file. However, this would have to be thoroughly tested to ensure no functionality is lost by the change.
This was first published in May 2002