Don’t forget to add a fun, relevant call-to-action button to your email. [insert fun loading text here] Boost your email opens with a punchy subject line. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Time to get that bread. Is anyone even reading this? Test, test, and test again! Make sure your email looks good on all devices before you send it out. Keep your email subject line short and attention-grabbing.