While there is no functioning Comment Mail Pro trial at this time, the free version of Comment Mail includes a Pro Preview that allows you to review the Pro features inside the plugin itself.

When you click the "Preview Pro Features" link, the hidden Pro feature option panels will be shown and you can expand each panel to review the details of those features.

Comment Mail: Preview Pro Features

Comment Mail: Preview Pro Features

Comment Mail: Pro Upgrade

To upgrade to Comment Mail Pro, visit Comment-Mail.com or click the "Pro Upgrade" link inside Comment Mail to purchase a Single-Site or Unlimited-Site License.