Get creative with emojis in email subject lines to increase open rates! 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Not just a pretty interface I’m worth the wait Don’t forget to add a fun, relevant call-to-action button to your email. Test, test, and test again! Make sure your email looks good on all devices before you send it out. Generating witty text... Sit up straight.