ga-send-email-link-click.js

const emailLinks = document.querySelectorAll('a[href^="mailto:"]');

emailLinks.forEach(function(emailLink){

    emailLink.addEventListener('click', () => {

        gtag('event', 'link_click', {
            event_category: 'Links',
            event_action: 'Click',
            event_label: 'Email link'
        });

    }, { once: true });

});