If you're sending 50 or fewer emails a month, then Direct Mail is completely free. If you need to send more, then you'll want to sign up for a Direct Mail account. There are a variety of pricing plans available to fit your budget.
To sign up for a Direct Mail account, choose Direct Mail > Direct Mail Account from the menu bar.
What does 50 emails mean?
50 emails means either 1 email to 50 recipients or 50 emails to 1 recipient (or anywhere in between).