I’m worth the wait Sit up straight. Boost your email opens with a punchy subject line. Want the loading time to be longer so we can spend more time together :) Not just a pretty interface 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. Test, test, and test again! Make sure your email looks good on all devices before you send it out.