Don’t forget to add a fun, relevant call-to-action button to your email. Is anyone even reading this? [insert fun loading text here] A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Boost your email opens with a punchy subject line. Try different email subject line styles to find what gets the most opens. I wish I looked as good as you while waiting Keep your email subject line short and attention-grabbing.