I am assuming you are applying outland for your husband. You can use Canada post or a private courier.
If you send by Canada Post:
Sponsorship: (Type of sponsorship)
Case Processing Centre ─ Mississauga
P.O. Box 3000, Station A
Mississauga, Ontario
L5A 4N6
If you send by Private Courier:
Sponsorship: (type of sponsorship)
Case Processing Centre – Mississauga
2 Robert Speck Parkway,
Suite 300
Mississauga, ON
L4Z 1H8
Here is the link for the information:
Make sure that the package is trackable.
Also, probably you already know, when you receive the file from your husband, you have to add your part of the application and then send both together to Mississauga.