It is possible for an email address to be included in the same list more than once. Although this is the case, Act-On ensures that email messages sent to the list automatically suppress the duplicates.

One way to help keep the 'not sent/suppressed' figures low in a Sent Message report and to maintain a high-quality list is to delete the duplicate records. This can be accomplished directly within the list. 

Follow the steps below to delete duplicate records in a list:

1. Click on Contacts, and choose Marketing Lists, Other Lists > Form Submissions, or Other Lists > Webinar Lists.
2. Click on the list to display the menu
3. Click Maintenance > Delete Duplicates. Act-On will provide you with a list of all the duplicate records by email address.
4. Click on the email address that you would like to review. Act-On will show all the records associated with that email address.
5. Decide if you wish to Keep All or keep a specific record.
6. Click the red Delete icon at the top of the page.