The questionnaire will only accept valid email address. If an error message pops up after you enter your email address, you may have entered your email address incorrectly.
Please check the email address you entered for typos. Common typos include typing a "." instead of the "@" sign or mistyping the end of email address, such as .co instead of .com or .nett instead of .net.
Please check to see if you forgot the "@" symbol and make sure that the end of your email is correct.