"Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula Don’t forget to add a fun, relevant call-to-action button to your email. Let your imagination run wild. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Is anyone even reading this? Boost your email opens with a punchy subject line. Keep your email subject line short and attention-grabbing. Time to get that bread.