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 Sit up straight. Keep your email subject line short and attention-grabbing. Try different email subject line styles to find what gets the most opens. Get creative with emojis in email subject lines to increase open rates! 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t make ‘em yawn! Keep your emails exciting and brief.