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It says an error :

Not Found
The requested URL /shadowbot/delete.user.php was not found on this server.
Apache/2.4.18 (Ubuntu) Server at shadowbot.us Port 80Not Found
The requested URL /shadowbot/delete.user.php was not found on this server.
Apache/2.4.18 (Ubuntu) Server at shadowbot.us Port 80

He just changed his password and his private posting key to unsuscribe .

He just registered again. Sorry for all but can you answer my other comment ?

Okay hmm, I will take a look at what happened, it seems to be working on our end but there was something wrong on his end...