diff --git a/externals/phpmailer/class.pop3.php b/externals/phpmailer/class.pop3.php
--- a/externals/phpmailer/class.pop3.php
+++ b/externals/phpmailer/class.pop3.php
@@ -142,7 +142,7 @@
    * @param string $username
    * @param string $password
    */
-  public function Authorise ($host, $port = false, $tval = false, $username, $password, $debug_level = 0) {
+  public function Authorise ($host, $port = false, $tval = false, $username = '', $password = '', $debug_level = 0) {
     $this->host = $host;
 
     //  If no port value is passed, retrieve it