Hi,

Basically reducing the term would impact overall policies until they are changed again. My suggestion was to allow ad-hoc clearance.

Consider this scenario:
1000 spam emails come in on Monday we would have to wait until the day 'completes' (Tuesday Morning) in order for your internal engine to complete its set period to flush emails from disk. 
My way would allow an admin to login, see a 1000 unwanted emails, search and filter, then clear them before the 9pm incremental backup. Admin goes to bed with less junk backed up.
Saves space, time and doesn't involve changing current retention policies which many need to keep in place.

Cron job is totally different from simply logging in, clicking junk repository, searching for emails by sender (or time, or date or Ip, etc.), simply check box them, clicking immediate purge and forgetting about what just happened.. :)

We could right power shell scripts and all sorts of fancy things.  The point here is to make things easier.

Your call, just a suggestion.  Let me know if it can be included in the next version.

cheers.