Weird code embedded in emails sent

When analyzing the spam and deliverability of my emails using mail-tester, I get a warning that "5 dangerous elements (that is javascript, iframes, etc) were found while analysing your message."

These elements are:

(function() { try { var sp_old_HTMLFormElementPrototype_submit = HTMLFormElement.prototype.submit; HTMLFormElement.prototype.submit = function() { try { var spEvent = document.createEvent('Ev...
(function() { try { var sp_old_HTMLFormElementPrototype_submit = HTMLFormElement.prototype.submit; HTMLFormElement.prototype.submit = function() { try { var spEvent = document.createEvent('Ev...
(function() { try { var sp_old_HTMLFormElementPrototype_submit = HTMLFormElement.prototype.submit; HTMLFormElement.prototype.submit = function() { try { var spEvent = document.createEvent('Ev...
(function() { try { var sp_old_HTMLFormElementPrototype_submit = HTMLFormElement.prototype.submit; HTMLFormElement.prototype.submit = function() { try { var spEvent = document.createEvent('Ev...
(function() { try { var sp_old_HTMLFormElementPrototype_submit = HTMLFormElement.prototype.submit; HTMLFormElement.prototype.submit = function() { try { var spEvent = document.createEvent('Ev...

I do have adblock Plus disabled for all my domains and autoresponder install.

Any help would be appreciated.