devices is more common than desktop or webmail clients. • Readers are less likely to click through on mobile. • If a mobile reader opens an email again from a different device, more clicks happen. https://www.campaignmonitor.com/resources/guides/email-marketing-trends/
best practices, separation of content and styles, DRY coding, proper CSS specificity, and almost everything that you’ve probably been taught about responsive web design… and throw it away!