Don’t forget to add a fun, relevant call-to-action button to your email. Feel free to spin in your chair while you wait I’m worth the wait Want the loading time to be longer so we can spend more time together :) Get creative with emojis in email subject lines to increase open rates! Let your imagination run wild. Try different email subject line styles to find what gets the most opens. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.