With Atlantis you can print either single or multiple envelopes for private or bulk mail.

To create new envelopes, choose the Tools | Envelopes... menu The main menu or simply menu is a horizontal bar with clickable commands anchored to the top of the main window of Atlantis:

command. It brings up a dedicated Envelopes dialog. With this dialog, envelopes can be created, printed immediately or attached to the active document and printed at a later time at your convenience.