All existing mailing lists can be found using Mailing list - Overview. Each mailing list is shown with its internal number, name, and owner. The 
-sign next to the internal number indicates a personalized mailing list. Personalized refers to beeing able to address your subscribers personally. Please refer to Campaign - Management --> Publish Campaign for further details. An 
-sign next to the number indicates an active inline-image feature. Clicking on the owners name opens a form enabling you to send an email to that person. You are able to modify or delete a mailing list as well.