Sit up straight. Get creative with emojis in email subject lines to increase open rates! Test, test, and test again! Make sure your email looks good on all devices before you send it out. Feel free to spin in your chair while you wait Boost your email opens with a punchy subject line. Don’t forget to add a short preview description to encourage people to click on your email. Let your imagination run wild. Keep your email subject line short and attention-grabbing.