did you made new admin in the Mercury with your own password and name?
the e-mail from bittorrent.php must be the same as the one in Mercury
When you install XAMPP in Mercury mail there is an admin by default so you need to delete that one and make another one with your username and password
And in bittorrent.php on line 148-149 you have
Code:
// Email for sender/return path.
$SITEEMAIL = "noreply@localhost";
so you need to change that to the one you have in Mercury mail!