Don’t forget to add a fun, relevant call-to-action button to your email. Boost your email opens with a punchy subject line. Feel free to spin in your chair while you wait Keep your email subject line short and attention-grabbing. Sit up straight. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Get creative with emojis in email subject lines to increase open rates! Don’t make ‘em yawn! Keep your emails exciting and brief.