Thanks..I applied through an agent..they did not forward me the email..rather they probably would have copied the email and sent to me as an attachment..So the dates and other details were missing..it had my UCI and application number..thanks for the details..I am asked to submit the passport in 30 days..my PPR was in email body. It is dated. I wouldn't call it a letter headed but it has my UCI and Application details and it has 'Government of Canada' with the country's flag on top of the email. I was given 15 days to submit with specifications on how to submit.
I hope this was helpful.