Obviously you don't, because you posted. I think something messed up during the last round of maintenance. Someone else posted a week or two ago about not getting this email. It seems you are getting activated without it.
I'm unsure, that is what was supposed to happen before. I didn't know you could post without the activation email. Things have changed since I signed up quite a bit. I think it's a matter of wait and see, if your account is deleted you can recreate it again and we can go from there.