The order form is reporting an error with my email address - how do I fix this?

All standard format email addresses that include @ and a .com / .org / .us (or equivalent) and no extra spaces will be accepted by the order form. 

An error message usually happens when your browser has a form autofill feature that is including an extra space in the email. To fix, check for an extra space before or at the end of the email address to delete it, or retype the email address completely.