Don’t forget to add a fun, relevant call-to-action button to your email. Is anyone even reading this? Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line. "I use PosterMyWall to create flyers for the MANY non-profit organizations that we are involved with!" - Stachia 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Sit up straight. Let your imagination run wild.