If you find that your confirmation emails through VYPER are going to spam, I'd recommend a few options.
#1 - Add your own SMTP provider. This helps you untie your sending reputation from VYPER, where we use a shared IP pool.
#2 - Once added, test a contest entry using Mail Tester. So sign up for your own contest with the Mail Tester email.
#3 - Once you're signed up, fix any problems with your SMTP setup with Mail Tester.