If you wish to resend your release to the contacts who have not opened your email you can do so by following the steps below.
Step 1. Save unopened contacts as a list
Go to Amplify > Manage Email Distribution and open the report of the sent distribution.
On the report click "Unopened” on the left to show all the contacts who have unopened
Select the unopened contacts (Increase the number of results to show 200 to click through minimum pages)
Actions > Save selected as a list
Step 2. Resending the previously sent release
Go to Amplify >Manage Email Distribution > Click Copy under the Actions column of the release you wish to resend.
Click on Edit under the Actions column of the copied version to open step 1 of the distribution setup.
On step 1 of the distribution setup, select the list with the saved unopened contacts (ensure that you have deselected any other lists).
Follow distribution setup through to step 4 to complete the send.