MySteinberg wont send activate email to my main email

I’m so sorry for posting this here, but I want to register my cubase and addons, but when I try and reg with the MySteinberg, I never get the activation email, I used another email address I had and I got the activation email, I dont want to reg my app with the email that worked, I want to reg with my main email. it seems like my email is blocked for some reason, I asure you that I behave perfectly online and cant see there being a real reason other than a mistake, I also had this problem with some other activation sites, I feel like someone has flagged my email as bad, but there is NO proper reason for it, can you help?