The Mailing list ID is the unique identification number of your Mailing list. You can find the Mailing list ID by following the steps below.
1. Click on the Mailing lists button, located on the left side of your Dashboard page.
2. Click on the name of the mailing list that you wish find the Mailing list ID.
3. You can find the Mailing List ID on the right top corner of your page.