I assume its the one at the footer of the PPR, I also found it strange they didn't clearly specify where to send it. We just sent ours today through VFS Global. They already know where to send Canada passport requests, we didn't need to specify the address. Maybe Sunil Siwatch or mumbaigirl can clarify if they used couriers instead of VFS.
Here is the one at the footer of the request:
Immigration Section - Service de l'Immigration
7/8 Shantipath, Chanakyapuri PO Box 5209 New Delhi 110021
Thank you. I will try askin the same question in NDVO thread.