Mark all unposted letters as Posted

If the To Do list on the dashboard is showing that you have a large number of Letters to be posted and you do not intend to actually post those letters but simply wish to clear the item from your To Do list,  you can mark all unposted letters as posted,  by following these steps:

1. Go to the Communications menu item and click on Messages to view the list of communications
2. Click on the Outbox Ungrouped tab  
3. Using the controls at the bottom of the list, change the number of rows displayed per page to 100 rows
4. At the top of the list now, click Show filter to reveal the filters for each column
5. In the  Status column dropdown click Letter prepared to filter the list to all letters which have been prepared but not yet posted
6. Click the checkbox to in the header row to select all 
7. From the Message actions dropdown select Mark as posted to mark all the selected letters as posted
8. Note that you may need to repeat steps 4 through 8 multiple times, to mark all your unposted letters as posted, if you have more than 100 unposted letters