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. [insert fun loading text here] Keep your email subject line short and attention-grabbing. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Sit up straight. Fighting off robots… Avoid getting marked as spam! Only email people who have agreed to receive emails from you.