start() {@inheritdoc}

isStarted() {@inheritdoc}

string setKey(string $key) Set the API key being used by the transport

send(Swift_Mime_Message $message, $failedRecipients = null) {@inheritdoc}

stop() {@inheritdoc}

send(Swift_Mime_Message $message, $failedRecipients = null) {@inheritdoc}

bool isDeferred() Determine if the provider is deferred.

stop() {@inheritdoc}

void setSwiftMailer(Swift_Mailer $swift) Set the Swift Mailer instance

mixed sendNow(Mailable $mailable)