WWW_RECAPTCHA_SITEKEY

This configuration variable defines the reCAPTCHA site key used for client-side authentication. Note that the site key is different from the secret key. To use this type of Captcha solution, you need to copy and paste your unique site key from the reCAPTCHA admin console into this field, and then copy and paste your unique secret key, which is used for server-side authentication, into the captcha.keys configuration file in the "captcha" folder in your archives directory. Also enter your LISTSERV domain name and your LISTSERV Captcha Badge (if enabled). A sample configuration file named default.keys can be found in the "captcha" folder. Enter your details into this file in a text editor, and save the file with the name captcha.keys.

This configuration variable is not set by default.