Don’t forget to add a fun, relevant call-to-action button to your email. Try different email subject line styles to find what gets the most opens. One Mississippi, two Mississippi… “Everything I have designed has a crisp professional look and feel. Love this service” - Cameron Let your imagination run wild. "Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line.