FLZapped
Quite frankly, the idea one would have to sign up after spending hundreds of dollars is nuts. Every other company I've done business with on the internet automatically sends me updates unless I specifically opt out.
It really shouldn't matter if I've signed up for emails or not when something as important as a major pricing policy change is happening. I should be notified regardless.
There are many (most?) users which have signed up once during the first product registration and have always received all notifications. There was one major change in accounting several years ago, when Cakewalk Shop account was merged with Cakewalk Forum account.
When e-mail addresses was changed or was different in 2 registrations, there was several reports people had problems.
Also some web/e-mail providers ban complete networks after any attack attempt from related IP address range, in that case mails can not be delivered (I had that recently with my site, provider has blocked many IP ranges after several massive attacks from all over the world. I have only notices that because a kind user of this forum took time to PM me that the link in my signature is not working for him).
What I mean, the problem can be at place other then CW.