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How to stop Node Comments Spam in Drupal 7

Getting buried in Spam?

Spammers generally use comment feature to post spam links on your Drupal powered websites. Here is how you can control spam comments to large extent.

Use Mollom Module
Mollom is a great Drupal module to control spams. Mollom handles incoming posts intelligently, in much the same way a human moderator decides what posts are acceptable.
http://drupal.org/project/mollom

Use CAPTCHA Module
A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human.
http://drupal.org/project/captcha

Make Preview comment necessary
Enable Preview comment necessary from Administrator >> Content types >> page / story >> Edit >> Comments settings.

You can further control spam, by allowing only registered users to post comment.

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