"We carefully reviewed applications for the Customer Support Specialist role, and unfortunately, at this time we will not be moving forward with your candidacy."
WHY?
WHY?
What in the world could all this time I've been doing your exact job requirements have possibly disqualified me from the position?!
[metaphorically throws things]
You may not have been disqualified: They may just have had a bunch of applicants who were all qualified but needing fewer than applied. Hopefully looking at it that way takes a bit of the sting out of it 
Sorry.
...maybe a tiny amount of sting. [gestures with pinched fingers and a squint]