Get creative with emojis in email subject lines to increase open rates! Want the loading time to be longer so we can spend more time together :) Keep your email subject line short and attention-grabbing. Feel free to spin in your chair while you wait Test, test, and test again! Make sure your email looks good on all devices before you send it out. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! One Mississippi, two Mississippi… A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.