DO NOT use <span> or <div> tags and then proceed to handle their click events. Use proper <a> tags. This breaks so many things!

Put mailto: links only where the email-id is the visible text too. [email protected] is so much better than Contact Email. Not everyone has email clients configured, and opening bulky clients when clicking a link is just bad UX. Or people might just want to note down the address, to contact later.