Opening the door to unlimited creativity… I’m worth the wait Test, test, and test again! Make sure your email looks good on all devices before you send it out. One Mississippi, two Mississippi… We’re very font of you because you’re our type. 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! Keep your email subject line short and attention-grabbing.