Module: Drupal Module Reviews and Ratings

This is a gateway module for responding to posts via email. It links outgoing notifications emails with incoming email responses using a combination of mail parameters and digital signatures.

When enabled, it adds to outgoing notifications emails a message that looks like:

((( Reply ABOVE this LINE to POST a COMMENT )))

Then the receiver just needs to reply to the mail and the text above will be posted to the original thread as a comment.

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Courtesy : http://drupalmodules.com