CRM Survey through Mailto option

Hi,

I have done settings to send survey to customers by mailto option according to the tutorial posted by Mr Gregor Wolf in the below link

http://wiki.sdn.sap.com/wiki/display/CRM/Survey+processing+without+opening+a+connection+to+the+CRM+Backend+from+the+Internet

Now i have maintained the mail id mentioned in the Parameter XML in SO50 tcode with the Exit Class as CL_SVY_SMTP_INBOUND.

I downloaded the presentation format by giving the following options

Send Options : mailto

Send File : The Parameter XML File in which i have maintained the mail id

Media Type : Screen

After downloading i am opening it in explorer and filling my survey value and sending it through outlook.

I have checked the receipient mail id too and the same is receiving the POSTDATA.ATT file but the same is not getting processed and Evaluation is not getting updated.

Kindly help regarding the same. Is there any other configuration for Inbound processing of data which i need to configure.