--- a/web/lib/Zend/View/Helper/Gravatar.php	Thu May 07 15:10:09 2015 +0200
+++ b/web/lib/Zend/View/Helper/Gravatar.php	Thu May 07 15:16:02 2015 +0200
@@ -310,7 +310,7 @@
     {
         $src = $this->_getGravatarUrl()
              . '/'
-             . md5($this->getEmail())
+             . md5(strtolower(trim($this->getEmail())))
              . '?s='
              . $this->getImgSize()
              . '&d='