51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! One Mississippi, two Mississippi… Test, test, and test again! Make sure your email looks good on all devices before you send it out. Sit up straight. Generating witty text... Don’t forget to add a fun, relevant call-to-action button to your email. Keep your email subject line short and attention-grabbing. Try different email subject line styles to find what gets the most opens.