Time to get that bread. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Fighting off robots… Try different email subject line styles to find what gets the most opens. Test, test, and test again! Make sure your email looks good on all devices before you send it out. Sit up straight. Boost your email opens with a punchy subject line. Keep your email subject line short and attention-grabbing.