/**
* Attach a file to your message.
*
* @param File $file File instance
* @param string $fileName Optional name that will be set for the attachment.
* @param string $type Optional MIME type of the attachment
*
* @return $this
*/
public function addAttachment(File $file, $fileName = '', $type = 'plain/text')
{
$this->message->addAttachment($file->getAbsolutePath(), $fileName);
return $this;
}