How can I check that if my email address is registered on the Abarlink or not?

In order to see that if an email address is registered on the abarlink or not, you can try to create a new account with the same email by clicking here.
After completing the registration form and clicking on “Register” button, if an error message appeared based on that “The specified email address is already used”, this means that your email address had been used to register a user account. if you do not receive an error message, it means that your email address had not been used to register an account.