Don’t forget to add a fun, relevant call-to-action button to your email. Keep your email subject line short and attention-grabbing. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Generating witty text... Sit up straight. Try different email subject line styles to find what gets the most opens. "Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula Don’t make ‘em yawn! Keep your emails exciting and brief.