The document discusses 4 email marketing trends for 2013: 1) Email marketing remains highly effective with a high ROI. 2) Marketing is shifting from standalone email campaigns to integrated customer relationship management across the lifecycle. 3) Deliverability is increasingly dependent on both technical and more subjective metrics. 4) Mobile readership of email is growing rapidly as people access their inboxes through many devices, so email design must be optimized for small screens. The author provides advice on designing emails that are readable and functional on mobile.