At present, saving a draft of a mailshot for later editing and sending isn't supported. Nonetheless, restarting a mailshot is a straightforward process. Here are three convenient methods:
From Projects: Access 'Projects' and click the three dots icon at the top-right corner of your columns, then select 'Send letters' from the dropdown menu.
From a Title: Navigate to the desired title and spot the envelope icon ✉ next to the 'Save' button. Click on it to commence letter sending.
Via the Land Assembly Tool: Upon creating your assembly setup, find the 'Send letters' button at the bottom. Simply click on it to initiate the letter sending process.
Choose the method that suits your workflow best and restart sending letters.