The kiln form returns internal server error upon submission, happened to me +1 fellow potter today. Refreshing doesn’t help, no email either. We marked our pieces as “KO-?”, they’re on the glaze 6 shelf 
Thank you for reporting this. Email and the drop off site are back up and running.
It was a bug a year in the making. So many dropoffs and some bad fetch logic. It’s all good now!
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