Get creative with emojis in email subject lines to increase open rates! I’m worth the wait We’re very font of you because you’re our type. Boost your email opens with a punchy subject line. Keep your email subject line short and attention-grabbing. Test, test, and test again! Make sure your email looks good on all devices before you send it out. Feel free to spin in your chair while you wait 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email!