Sit up straight. Don’t forget to add a fun, relevant call-to-action button to your email. "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! Don’t make ‘em yawn! Keep your emails exciting and brief. Try different email subject line styles to find what gets the most opens. Keep your email subject line short and attention-grabbing. Let your imagination run wild.