Strange email received

Hi,
hope you can tell me more of the related I keep receiving for pass few days:
=========================================

Thank you for shopping at COMPANY NAME.

Shopping details is as below.

Item Name = balance
Item ID =
Amount = 0
Payment Method = moneybookers
Status = Failed

Kind regards,
YourDomain

-POST Var
Array
(
[transactionID] => 1 AND 0 UNIRLIKEON SELINSERTECT 1,2,3,4,0x6d6f6e6579626f6f6b657273,0x272c27272c27272c27272c27272c27272c27272c27272c27272c2727292c2827272c273c3f7068702065787.........23,7,8,9,10,11,12,13,14,null -INSERT-
[md5sig] => 80404D0C6........
[sess_id] => aa
[key] => 12a7dada2..........
[currency] => 244
)

=========================================

how can I prevent it if possible? Thank you for any advise.