140d139
< 			default:
143a143,152
> 				
> 			default:
> 					// Attempt to load the defined MailTransport and use it, otherwise throw exception
> 				$transportClassName = $mailSettings['transport'];
> 				$interfaceClassName = "Swift_Transport";
> 				if (class_exists($transportClassName) && class_implements($interfaceClassName)) {
> 					$this->transport = t3lib_div::makeInstance($transportClassName);
> 				} else {
> 					throw new t3lib_exception("Invalid user-defined MailTransport, aborting sending");
> 				}