* proceed to read the response body with [Response.body]. The response is still live until its
   * response body is [closed][ResponseBody]. The recipient of the callback may consume the response
   * body on another thread.
   *
   * Note that transport-layer success (receiving a HTTP response code, headers and body) does not

            putValue(data, "Sent-Date", message.getSentDate());
            putValue(data, "Size", message.getSize());
            putValue(data, "Subject", message.getSubject());
            putValue(data, "Receipients", message.getAllRecipients());
            putValue(data, "To", message.getRecipients(Message.RecipientType.TO));
            putValue(data, "Cc", message.getRecipients(Message.RecipientType.CC));

   * point to the first printing position on the next printing line. Use of this convention requires
   * agreement between sender and recipient of data.
   *
   * @since 8.0
   */
  public static final byte LF = 10;

  /**
   * Alternate name for {@link #LF}. ({@code LF} is preferred.)
   *
   * @since 8.0
   */

    // ============================================================
    // Notification Property Keys
    // ============================================================

    /** Property key for notification recipient configuration. */
    public static final String NOTIFICATION_TO_PROPERTY = "notification.to";

    /** Property key for Slack webhook URLs configuration. */