This is probably the nicest rejection email I've had to date:
Many thanks for your entry. We had over 200 entries and sorry to say your script wasn't selected for the final six. It did make it to a final shortlist of fifteen, however, and we thought it was an excellent piece of work...
Excellent work, eh? My best review ever, and it hasn't even been staged.
Producers of open script things take note: Be nice! Even if it's not true. Just pretend. Nothing wrong with some politeness to spare sensitive writerly feelings. OK?
I'm being a bit flippant. But a personalised email saying something nice genuinely does feel better than the usual half-hearted round robin seven months after the closing date/no response at all.
I did a playwriting course a couple of years and one of the tutors brought along some of his rejection letters. He had a lot of rejection letters, but is now wildly successful. So it just goes to show... something or other.