Sit up straight. "Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula Boost your email opens with a punchy subject line. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Want the loading time to be longer so we can spend more time together :) Don’t forget to add a fun, relevant call-to-action button to your email. Keep your email subject line short and attention-grabbing. Don’t make ‘em yawn! Keep your emails exciting and brief.