E Mail body and subject change in Alerts PI7.31

Hi,

I am referring to below thread.

http://scn.sap.com/thread/3209352

I have done all the configuration to receive alerts from SAP PI to my mailbox and I am getting alert mails for errors.

I am trying to customize the email subject and Body of the mail but without success. I tried all API provided for this.

We are using SAP PI Java Stack only.

Please help me edit subject and body of the alert mail.

Regards

Vidhi