up-yours.com - Here we go again

I thought I'd made this clear, but apparently not. I got an e-mail earlier, from a RoadRunner IP (residential US ISP), using an @up-yours.com address.

There's two problems here however;

1. It's an invalid address, so can't reply
2. The e-mail houses a childish threat, without actually telling me what I did to deserve it

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General
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Ref: PI0076181149255
Reason for message: Feedback Notification
Sent from Server: mysteryfcm.co.uk
Date submitted: 16 November 2011
Time submitted: 00:26:37
Submitted by: 76.181.149.255

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Details
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Name: Up yours
E-mail: kiss-my-ass@up-yours.com
How did you find us?: Search engine
... Other: Not provided
Site navigation: Very difficult
Comments:

Your scam is soon to be exposed my friend.

Enjoy...