A single bulk email is a way to send one email to a group of people.
To create a new bulk email:
Go to the Email Marketing page.
Click the "Add New" button.
Click "Single Bulk Email" in the dropdown.
While editing a single bulk email, there are 4 sections:
Auto-add settings, which is how you configure who (in your Sprout account) will recieve this email. You can build a set of filters for your contacts, leads, shoots, galleries and gallery guests.
Email list, which will preview you a list of recipients based on your auto-add settings. You can also manually add new contacts, existing contacts or import a CSV of contacts from here.
Email, which is where you'll edit the email to be sent.
Signup Forms, which is where you can create and configure ways for people to sign up for this from your website.