Generating witty text... Feel free to spin in your chair while you wait Keep your email subject line short and attention-grabbing. Don’t forget to add a fun, relevant call-to-action button to your email. Don’t make ‘em yawn! Keep your emails exciting and brief. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Not just a pretty interface Don’t forget to add a short preview description to encourage people to click on your email.