Keep your email subject line short and attention-grabbing. Fighting off robots… I’m worth the wait Want the loading time to be longer so we can spend more time together :) Let your imagination run wild. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t make ‘em yawn! Keep your emails exciting and brief. Don’t forget to add a short preview description to encourage people to click on your email.