You need to send the following;
Cover letter (Info about you)
First and last pages of your active passport (for all applicants) - It is mandatory and mentioned in your email
Medical acknowledgement letter received from hospital
PCC (If asked)
RPRF DD or credit card receipt
Last but not least;
The document request letter received from visa office (You might have received a pdf from NDVO)
Go through the email and pdf attachment throughly...
The address is
Immigration Section
High Commission of Canada
7/8 Shantipath, Chanakyapuri
New Delhi
The courier will be received by "Stamp" (as per courier traking system)
Good luck!
Reshma
PS: I saw people just casually reply to some queries without much information...If you dont have idea, pls dont post it...remember that it affects someones preparation..
(I am not a expert to advise you all...but still...)
All the best to all...Good luck!