Feel free to spin in your chair while you wait Keep your email subject line short and attention-grabbing. Sit up straight. Get creative with emojis in email subject lines to increase open rates! We’re very font of you because you’re our type. Don’t forget to add a fun, relevant call-to-action button to your email. Generating witty text... A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.