All good input from everyone.
The key when using InfoPrintServer is to interrupt the process before the spoolfile hits the outq.
Not easily done.
So here's some new logic that might work for all AJS jobs.
This would not work for spoolfiles created directly by an application.
By default, have the spoolfiles set to HOLD *YES, thus will not be emailed.
Create one new generic utility that would look for an "empty spoolfile"
If "not empty" change from HOLD yes to HOLD no, or release the spoolfile.