Keep your email subject line short and attention-grabbing. I’m worth the wait Opening the door to unlimited creativity… Let your imagination run wild. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Not just a pretty interface Avoid getting marked as spam! Only email people who have agreed to receive emails from you.