Try different email subject line styles to find what gets the most opens. Let your imagination run wild. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t forget to add a fun, relevant call-to-action button to your email. My day’s been ok, how’s yours? Want the loading time to be longer so we can spend more time together :) Generating witty text... Avoid getting marked as spam! Only email people who have agreed to receive emails from you.