Hi again, If anyone is interested in updating a FileMaker database or something similar I came up with the following solution.
Use .qmailadmin-hooks with a path to the program you wish to execute. In my case, it was a shell script on the condition an account was modified (moduser). The shell script then passed some command line variables into a php script, which handles the necessary XML to update the FileMaker database for the change. Cheers, Phillip