Location: Administration > Users > Authentication
With this method, users can create their own accounts. They then receive an email at the address they specified in their account profile to confirm their account.
Email-based self-registration should be selected from the self registration drop-down menu in the common settings section on the authentication page.
Particular email domains may be allowed or denied via Administration > Server > Email.
Enable reCAPTCHA element
A CAPTCHA is a program that can tell whether its user is a human or a computer. CAPTCHAs are used by many websites to prevent abuse from bots, or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.
Template:Moodle 1.9From Moodle 1.9.1 onwards, spam protection may be added to the email-based self-registration new account form with a CAPTCHA element - a challenge-response test used to determine whether the user is human.
In addition to enabling the reCAPTCHA element, email-based self-registration should be set as the self registration authentication plugin and reCAPTCHA keys should be set in the manage authentication common settings.