Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line. Opening the door to unlimited creativity… Get creative with emojis in email subject lines to increase open rates! I’m worth the wait We’re very font of you because you’re our type. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t forget to add a fun, relevant call-to-action button to your email.