Let's begin with a few simple definitions as stated by the Canadian Government via the fightspam website (CASL) and the CRTC website. As there seems to be a lot of confusion out there, let's see if we can clear a few things up.
If you are sending a CEM to an electronic address, then you need to comply with three requirements.
You need to:
(1) obtain consent,
(2) provide identification information, and
(3) provide an unsubscribe mechanism.