@Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("rawString", rawString.length())
        .add("containerIds", containerIds.size())
        .toString();
  }
Container, e.g. folder or label, this message belongs to *
portability-types-common/src/main/java/org/datatransferproject/types/common/models/mail/MailMessageModel.java