On Tuesday, we added a new tool to help prevent spam comments from being posted to your blog. Using CAPTCHAs to validate commenters as actual humans, and not machines or spambots, is a powerful way to ensure that only legitimate comments are published.
You can enable the CAPTCHA option by going to the "Edit Configuration" link in the Weblogs tab. Click through "Preferences" and scroll down to Comment and TrackBack Preferences. There, check the box for "Require unauthenticated commenters to validate with a CAPTCHA?" and save your changes at the bottom of the page.
After republishing your blog, commenters will be shown a CAPTCHA image to enter before their comment is published.
Note that if you have Comment Authentication set to "Required," the option to require validation with a CAPTCHA will be unavailable. In this case, commenters will be validated with their TypeKey identities.
More information about this, and all of TypePad's other features, can be found in our searchable Knowledge Base.