string IMAP::Message::parseFrom(clist* from_lst){
  for (clistiter* it = clist_begin(from_lst); it != NULL; it = clist_next(it)){
    auto address = (mailimap_address*) clist_content(it);
    if (address->ad_mailbox_name && address->ad_host_name){
      from += address->ad_mailbox_name;
      from += '@';
      from += address->ad_host_name;
    } else
      from += "<UNKNOWN>";
    from += "; ";
  }
}