Click the pencil icon in the bottom left corner of the window.Select 'Mailing Labels' from the dropdown list.Pull up the list of people you'd like to create mailing labels for (by running an advanced search, searching by tag, or another method).Additionally, mailing labels print in all Caps to comply with USPS regulations. do not support the mailing label format used. At this time, the file generated can only be opened in Microsoft Word (both PC and Mac) as alternate programs such as Pages, Open Office, etc. Mailing labels download in Microsoft Word format.