If you have more than one list in your account, there's a chance that the same subscriber may be subscribed to more than one list. How to mail all of your subscribers at the same time with no duplicates.
Start a Single Mailing Campaign.
After selecting the primary list, choose additional list(s) by clicking on the drop-down below Add More Lists to this Campaign. Click the name of your lists to add or remove the list from the campaign. Lists that are currently selected will have a checkmark to the right of the list's name.
Once you have selected your audience. You will continue with the usual process of sending a single mailing campaign.
And that's it! As always, if you have any questions, please don't hesitate to let us know. You can find all of our great support resources and how to get in touch with us via email, chat or phone on our Support Page.