Sent group letters can be found in the Old group letters view.
The letter list rows contain information columns Created, Sent, amount of recipients, Title, and text from the beginning of the letter. If the letter was formed on a personal PDF letter template, the file name is shown in the title and the text is empty. You can view the letter by selecting the row and clicking the Show letter button. The recipients and sending channels by recipient can be viewed in the window opening at the bottom of the view by using the Show recipients button. If you want to delete old letters, select the row and click the Delete letter button.