second try

components/com_users/models/registration.php

@@ -613,7 +613,7 @@ public function register($temp)
 
 			// Get all admin users
 			$query->clear()
-				->select($db->quoteName(array('name', 'email', 'sendEmail')))
+				->select($db->quoteName(array('name', 'email', 'sendEmail', 'id')))
 				->from($db->quoteName('#__users'))
 				->where($db->quoteName('sendEmail') . ' = 1')
 				->where($db->quoteName('block') . ' = 0');
@@ -631,17 +631,22 @@ public function register($temp)
 				return false;
 			}
 
-			// Send mail to all superadministrators id
+			// Send mail to all users with users creating permissions and receiving system emails
 			foreach ($rows as $row)
 			{
-				$return = JFactory::getMailer()->sendMail($data['mailfrom'], $data['fromname'], $row->email, $emailSubject, $emailBodyAdmin);
+				$usercreator = JFactory::getUser($row->id);
 
-				// Check for an error.
-				if ($return !== true)
+				if ($usercreator->authorise('core.create', 'com_users') && $usercreator->authorise('core.manage', 'com_users'))
 				{
-					$this->setError(JText::_('COM_USERS_REGISTRATION_ACTIVATION_NOTIFY_SEND_MAIL_FAILED'));
+					$return = JFactory::getMailer()->sendMail($data['mailfrom'], $data['fromname'], $row->email, $emailSubject, $emailBodyAdmin);
 
-					return false;
+					// Check for an error.
+					if ($return !== true)
+					{
+						$this->setError(JText::_('COM_USERS_REGISTRATION_ACTIVATION_NOTIFY_SEND_MAIL_FAILED'));
+
+						return false;
+					}
 				}
 			}
 		}