RedIM currently has a feature that generates a pre-run notification for jobs, however if you need to reschedule the job it will not re-send the notification based on your update. Example: You want to rotate a password and notify users in advance. The pre-run alert sends the notification email and your users request to postpone. You update the job schedule, however you will not get another notification until the job actually runs and resets the flags.
Here is the details:
In the database, it appears that the flag is tied to the job in tbl_JobUpdatePassword. For jobs with the flag on, you should see value dwEmailOnChange set to 1, with sEmailOnChange containing the email address(es) to which the notifications will be sent. For a job with the flag off, it appears that dwEmailOnChange is set to 0, with sEmailOnChange being blanked out.