Don’t forget to add a fun, relevant call-to-action button to your email. Fighting off robots… Keep your email subject line short and attention-grabbing. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Want the loading time to be longer so we can spend more time together :) I wish I looked as good as you while waiting One Mississippi, two Mississippi… Don’t make ‘em yawn! Keep your emails exciting and brief.