Sending Marketing Emails is currently available for the Silver Plan and above. An additional charge may be applied to marketing email sends. See the Pricing Page for more info.
SendGrid’s Marketing Email tool is a powerful web and API based interface that allows you to compose and send scheduled marketing campaigns from your SendGrid account. Marketing Emails can be split tested, lists can be managed, and recipients can manage their subscriptions. You can upload your marketing email to Facebook or Twitter directly from SendGrid, and much more!
For information on programmatically interfacing with SendGrid marketing emails, check out the Marketing Email API documentation.The Email Marketing Campaigns gives information about different types of marketing email campaigns. Here is more information on managing unsubscribes within the Marketing Application.