A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Get creative with emojis in email subject lines to increase open rates! My day’s been ok, how’s yours? Test, test, and test again! Make sure your email looks good on all devices before you send it out. Boost your email opens with a punchy subject line. Feel free to spin in your chair while you wait Sit up straight. Keep your email subject line short and attention-grabbing.