Keep your email subject line short and attention-grabbing. "Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula Let your imagination run wild. Sit up straight. Don’t make ‘em yawn! Keep your emails exciting and brief. Test, test, and test again! Make sure your email looks good on all devices before you send it out. One Mississippi, two Mississippi… Boost your email opens with a punchy subject line.