Sit up straight. I’m worth the wait I wish I looked as good as you while waiting Keep your email subject line short and attention-grabbing. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. We’re very font of you because you’re our type. 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.