+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
I sent three four times with different couriers , to me Fedex was the best one. I don't suggest Canada post.

best,

Desert Lion said:
What is the best mail to Send the CIC application package to CIC
 
Hi,
I sent by Canpar but they delivered to wrong place at first attempt,i will not suggest Canpar.Purolator may be a choice.
 
Mine was CanadaPost priority mail, because I live quite far from Sydney. Was delivered in a coule of business days, with a signature.
 
Thanks to every one
I agree canada post takes longer time
And Canpar courier I will try to avoid
Will see what is close to me to send it by