There's nothing whatever to see there - no source code, no headers, no addressee, no sender, nothing. They sit in my Spamcop "held mail" folder with a reference number, but that's all there is. If I tell Spamcop to forward them, it queues them but nothing arrives.
They started on 27th Feb, when I got about a dozen. The rate increased to about 100 a day by 1st March, and has been there since.
I'm just curious as to what they are.