Generating witty text... [insert fun loading text here] Fighting off robots… Try different email subject line styles to find what gets the most opens. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! "I use PosterMyWall to create flyers for the MANY non-profit organizations that we are involved with!" - Stachia Sit up straight. Keep your email subject line short and attention-grabbing.