Don’t forget to add a fun, relevant call-to-action button to your email. One Mississippi, two Mississippi… Get creative with emojis in email subject lines to increase open rates! Don’t make ‘em yawn! Keep your emails exciting and brief. Boost your email opens with a punchy subject line. Want the loading time to be longer so we can spend more time together :) I wish I looked as good as you while waiting Keep your email subject line short and attention-grabbing.