Get creative with emojis in email subject lines to increase open rates! One Mississippi, two Mississippi… I’m worth the wait Don’t forget to add a short preview description to encourage people to click on your email. Test, test, and test again! Make sure your email looks good on all devices before you send it out. "Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Sit up straight.