BlastWizard sent out both HTML and Text emails, how does it know which to deliver to each recipient?

Question

BlastWizard sends out both HTML and Text emails. How does it know which to deliver to each recipient?

Answer

BlastWizard sends email as Multi-Part MIME, which means that both the HTML and the Text versions are sent together. When a subscriber’s email client receives a multipart message, it accepts the HTML version if it can render HTML, otherwise it presents the plain text version.