You received a letter regarding results for the postdoctoral awards? Sounds to me like you're currently applying for PhD programs... Sorry if I just misunderstood your post!
I just received info from my department that I was awarded the CGS Doctoral Award by e-mail... Turns out that the department was notified recently and decided to pass along the info. I had to read the e-mail about four times because I was convinced that it was going to come in the form of a letter.