Iirc there is an open feat. request aboth this in the issue tracker. For now you're out of luck: you will have to create your own custom approval event.
The good news is that you can take the standard approval event and add 3 lines of php (towards the bottom of the file) for this email.
Principal Consultant International Business
Member of the Community Project Board
Hello I have the same problem Jun Zheng. Do you have solve your problem ? I have not "if ($ approved)" at line 275. Can you give me an example to solve my problem. Thank you