public CompositeMessageSink(MessageDaemon director) : base(director) { }
public MailgunMailerSink(MessageDaemon director) : base(director) { }
public TwilioSink(MessageDaemon director) : base(director) { }
public SMTPMessageSink(MessageDaemon director) : base(director) { SmtpPort = DEFAULT_SMTP_PORT; }