51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Try different email subject line styles to find what gets the most opens. We’re very font of you because you’re our type. Keep your email subject line short and attention-grabbing. Is anyone even reading this? Don’t forget to add a fun, relevant call-to-action button to your email. Fighting off robots… A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.