/**
* @param string $file
* @param string $content
* @param string $contentType
*
* @return string content id
*/
public function addEmbeddedFile($file, $content = null, $contentType = null)
{
try {
$mailPart = $this->message->addEmbeddedFile($file, $content, $contentType);
return $this->getIdFromMailPart($mailPart);
} catch (\Exception $e) {
throw new MailerException($e->getMessage());
}
}