Go to a project and click create new, then email:  

Create the email as new or pull it in from existing templates, when the email is ready click on 'Save as Draft':

The draft email will show under 'Important Documents' in the project, just click on the email title to open the email and send it or schedule it to be sent later: 

All drafted emails will also show on your overview screen:  

KeyWords: Email, draft

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