UX fails on registration with email activation

UX fails on registration with email activation

I try to register my business, but your User Experience fails, because you sent email activation to my customer@customdomain.com

WTF???? I try to create emails accounts with your service using my custom domain... My domain is new and i don't have email service LOL!

I can't complete activation steps
I can't access into Control Panel

Where sent email activation???? Please gift me a Gosthbuster for your User Experience.