MAIL_OBJECT_DEFAULT { SOLVED }

Please ...
Guys ... a couple of days, maybe 3 ... I receive this stuff on mail e-mail, from my site, it seems, but not sure ...

From: pietrosferrino.net@w-02.th.seeweb.it

<<
The following URL doesn't exist on the website www.pietrosferrino.net :
www.pietrosferrino.net/index.php/en/joo ... -of-smiles

Here are details about the user who generated the error, it will help you to analyse and correct the problem :
user_agent :
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)
Remote adress :
xx.xxx.xxx.xx

The last page visited before the error is :
Page unknown
The bad link should be in this page.
>>

Do You have any idea of what if this ??

Hi

There is nothing to worry about until You'll see the problem on the site. It's probably because You are still working on the site and some problem may occure due to some changes.

Ok ... I'll don't pay attention on it ...
Thank You Teitbite ^_^