Not just a pretty interface Don’t forget to add a fun, relevant call-to-action button to your email. Let your imagination run wild. 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! Fighting off robots… Try different email subject line styles to find what gets the most opens. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.