Boost your email opens with a punchy subject line. Fighting off robots… Get creative with emojis in email subject lines to increase open rates! Is anyone even reading this? 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t forget to add a fun, relevant call-to-action button to your email. One Mississippi, two Mississippi… Try different email subject line styles to find what gets the most opens.