Sorry to contradict Charlie, but I'd like to provide some clarification, as I'm not sure I'm understanding your specific scenario. First, if the user receives the initial notification, clicks the link to go to My Apps, and then responds to the alert by choosing the Uninstall option, the uninstall request should get submitted immediately, not on the next run of the scheduled task. So, it doesn't make sense to send a reminder notification "a few days before the software is reclaimed".
Second, when you set up the policy, you can set a "grace period" (i.e. if the user hasn't responded after XX days, automatically reclaim the software). As long as this grace period is set to be longer than the frequency of the My Apps notifications scheduled task, the user will continue to receive notifications each time the scheduled task runs, right up until the end of the grace period. After that time, the next cycle of the My Apps alert processing scheduled task will submit the uninstall request.
Now, if you're saying that you've modified the My Apps email notification to remove the link to My Apps and you are just asking them to reply to the email, then they will never be able to select the "Uninstall" or "Keep" actions (unless they happen to visit the My Apps tab in the UI on their own). In this case, they will still receive those scheduled reminders (weekly by default) until the grace period has lapsed. Keep in mind that the email notification will be the same every time the scheduled task runs. There is no distinction between a "first" notification and a "reminder" notification. So, if that's what you're trying to accomplish, then Charlie is correct that there is no separate "reminder" notification message.
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