Well this might be off-topic, but the help page does say we can ask about “Services provided by Ubuntu and Canonical,” and this seems to fall under that category.
I’ve signed up for the Ubuntu Newsletter (via the downloads page) several times (one of them I think being two years ago), and have never received one. I thought maybe they just didn’t exist anymore, but then I saw this question, which provides a link to a recent one. Does Canonical still email out these newsletters?
PS I don’t have a spam folder; the filter just adds “SPAM” in the subject of the email.