Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line. Avoid getting marked as spam! Only email people who have agreed to receive emails from you. I’m worth the wait Don’t forget to add a short preview description to encourage people to click on your email. Join 4 million members in making awesome marketing content. 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.