/**
* Add Mailgun tags to the message.
* Tag limit is 3.
*
* @param string|array $tags
*
* @return \Bogardo\Mailgun\Mail\Message
*/
public function tag($tags)
{
$tags = array_slice((array) $tags, 0, 3);
foreach ($tags as $tag) {
$this->messageBuilder->addTag($tag);
}
return $this;
}