Please put this script in the header of your website.

<script>
  // Function to handle click event on mailto links
  function handleMailtoClick(event) {
    event.preventDefault();

    const emailAddress = this.href.replace('mailto:', '');
    navigator.clipboard.writeText(emailAddress)
      .then(() => {
        // Show an alert for one second
        const alertMessage = `Email address copied: ${emailAddress}`;
        alert(alertMessage);
        setTimeout(function() {
          const alertBox = document.querySelector('.alert-box');
          alertBox.style.display = 'none';
        }, 800);
      })
      .catch((error) => {
        console.error('Failed to copy email address:', error);
      });
  }

  // Add event listeners to all mailto links on the page
  document.addEventListener('DOMContentLoaded', function () {
    const mailtoLinks = document.querySelectorAll('a[href^="mailto:"]');
    mailtoLinks.forEach((mailtoLink) => {
      mailtoLink.addEventListener('click', handleMailtoClick);
    });
  });
</script>