The percentages were: 48% personalization and 47% customer segmentation, which are campaign management strategies; 35% offer testing, 34% content testing, 26% frequency optimization, and 20% subject-line testing, which fall under the testing category; 33% real-time content, 27% dynamic content, and 21% triggered messages, which fall under contextual targeting; and 27% surveys, 23% polls, 23% video, and 19% AMP for email, which fall under in-email interactivity.