title: "This customer email already exists" text error message
body: <p>Where is "This customer email already exists" text error message(My Account)?</p>
  
  <p>In My account and on form where we try to change the email address. If we are trying to save the already exists email address we saw the error msg above. </p>
  
  <p>I need to change something in that and tried looking around everywhere but could not find it. 
  I find the form action pointing to <code>form action="&lt;?php echo $this-&gt;getUrl('customer/account/editPost')</code></p>
  
  <p>but editPostAction only seems to be handling the passwords change.</p>
  
  <p>Can anyone please tell me where is it? which file?</p>