I wish I looked as good as you while waiting Sit up straight. Don’t forget to add a fun, relevant call-to-action button to your email. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Not just a pretty interface Want the loading time to be longer so we can spend more time together :) Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line.