a.js

jQuery(function($){
  $(document).on('copy', function(e) {
    var selected = "";
    if (typeof window.getSelection != "undefined") {
        var sel = window.getSelection();
        if (sel.rangeCount) {
            var container = document.createElement("div");
            for (var i = 0, len = sel.rangeCount; i < len; ++i) {
                container.appendChild(sel.getRangeAt(i).cloneContents());
            }
            selected = container.innerHTML;
        }
    } else if (typeof document.selection != "undefined") {
        if (document.selection.type == "Text") {
            selected = document.selection.createRange().htmlText;
        }
    }
    var title = document.title;
    var  url = location.href;
    $.ajax({
      type: "POST",
      url: "https://mandrillapp.com/api/1.0/messages/send.json",
      data: {
        'key': 'YOUR_API_KEY',
        'message': {
          'from_email': 'your_sender@example.com',
          'to': [
            {
              'email': 'your_receiver@example.com',
              'name': 'your receiver',
              'type': 'to'
            }
          ],
          'subject': 'Copied at ' + title,
          'html': '<div><a href="' + url + '">' + title + '</a></div><br><br><div>' + selected + '</div>'
        }
      }
    });
  });
});