"Every day, over three hundred email recipients within the University have to clear out 20 to 30 junk emails which can take up to 30 minutes."
20 to 30! How awful!
(This is before I even get to the question of how on earth it can take you 30 minutes to delete 30 junk emails... unless they mean a total of 30 man-minutes across the 300 email recipients within the University ... and if so, why have they selected those 300 out of the 30,000-odd email recipients in the University?)