This MPF exit will send WTO messages to the user specified on the JCL NOTIFY jobcard statement.
This code is based on the original idea by Bob Hill.
The following example will cause "IEF099I JOB WAITING FOR DATASETS" to be send to the submitting user:
SYS1.PARMLIB(MPFLSTxx): IEF099I,USEREXIT(MPF$NTFY)
Sourcecode is distributed in distribution file mpfntfy.zip