Take the email below from Paperless Post, for example. I love the header of this email: It provides a clear CTA that includes a sense of urgency. Then, the subheader asks a question that forces recipients to think to themselves, "Wait, when is Mother's Day again? Did I buy Mom a card?" Below this copy, the simple grid design is both easy to scan and quite visually appealing. Each card picture is a CTA in and of itself -- click on any one of them, and you'll be taken to a purchase page.
An email blast is a single email message that is sent to a large group of recipients. Email blasts are no longer an email marketing best practice. Email marketers should segment their lists and send targeted messages to their subscribers. All email blasts need to follow the CAN-SPAM Act, include an unsubscribe link, and accurately identify the person or business that is deploying the email.