Don’t forget to add a fun, relevant call-to-action button to your email. [insert fun loading text here] Boost your email opens with a punchy subject line. Want the loading time to be longer so we can spend more time together :) I’m worth the wait 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t make ‘em yawn! Keep your emails exciting and brief. Let your imagination run wild.