| 
                  unknown |  | 
| 
                  a_im |  | 
| 
                  accept |  | 
| 
                  accept_additions |  | 
| 
                  accept_charset |  | 
| 
                  accept_datetime |  | 
| 
                  accept_encoding |  | 
| 
                  accept_features |  | 
| 
                  accept_language |  | 
| 
                  accept_patch |  | 
| 
                  accept_post |  | 
| 
                  accept_ranges |  | 
| 
                  access_control |  | 
| 
                  access_control_allow_credentials |  | 
| 
                  access_control_allow_headers |  | 
| 
                  access_control_allow_methods |  | 
| 
                  access_control_allow_origin |  | 
| 
                  access_control_expose_headers |  | 
| 
                  access_control_max_age |  | 
| 
                  access_control_request_headers |  | 
| 
                  access_control_request_method |  | 
| 
                  age |  | 
| 
                  allow |  | 
| 
                  alpn |  | 
| 
                  also_control |  | 
| 
                  alt_svc |  | 
| 
                  alt_used |  | 
| 
                  alternate_recipient |  | 
| 
                  alternates |  | 
| 
                  apparently_to |  | 
| 
                  apply_to_redirect_ref |  | 
| 
                  approved |  | 
| 
                  archive |  | 
| 
                  archived_at |  | 
| 
                  article_names |  | 
| 
                  article_updates |  | 
| 
                  authentication_control |  | 
| 
                  authentication_info |  | 
| 
                  authentication_results |  | 
| 
                  authorization |  | 
| 
                  auto_submitted |  | 
| 
                  autoforwarded |  | 
| 
                  autosubmitted |  | 
| 
                  base |  | 
| 
                  bcc |  | 
| 
                  body |  | 
| 
                  c_ext |  | 
| 
                  c_man |  | 
| 
                  c_opt |  | 
| 
                  c_pep |  | 
| 
                  c_pep_info |  | 
| 
                  cache_control |  | 
| 
                  caldav_timezones |  | 
| 
                  cancel_key |  | 
| 
                  cancel_lock |  | 
| 
                  cc |  | 
| 
                  close |  | 
| 
                  comments |  | 
| 
                  compliance |  | 
| 
                  connection |  | 
| 
                  content_alternative |  | 
| 
                  content_base |  | 
| 
                  content_description |  | 
| 
                  content_disposition |  | 
| 
                  content_duration |  | 
| 
                  content_encoding |  | 
| 
                  content_features |  | 
| 
                  content_id |  | 
| 
                  content_identifier |  | 
| 
                  content_language |  | 
| 
                  content_length |  | 
| 
                  content_location |  | 
| 
                  content_md5 |  | 
| 
                  content_range |  | 
| 
                  content_return |  | 
| 
                  content_script_type |  | 
| 
                  content_style_type |  | 
| 
                  content_transfer_encoding |  | 
| 
                  content_type |  | 
| 
                  content_version |  | 
| 
                  control |  | 
| 
                  conversion |  | 
| 
                  conversion_with_loss |  | 
| 
                  cookie |  | 
| 
                  cookie2 |  | 
| 
                  cost |  | 
| 
                  dasl |  | 
| 
                  date |  | 
| 
                  date_received |  | 
| 
                  dav |  | 
| 
                  default_style |  | 
| 
                  deferred_delivery |  | 
| 
                  delivery_date |  | 
| 
                  delta_base |  | 
| 
                  depth |  | 
| 
                  derived_from |  | 
| 
                  destination |  | 
| 
                  differential_id |  | 
| 
                  digest |  | 
| 
                  discarded_x400_ipms_extensions |  | 
| 
                  discarded_x400_mts_extensions |  | 
| 
                  disclose_recipients |  | 
| 
                  disposition_notification_options |  | 
| 
                  disposition_notification_to |  | 
| 
                  distribution |  | 
| 
                  dkim_signature |  | 
| 
                  dl_expansion_history |  | 
| 
                  downgraded_bcc |  | 
| 
                  downgraded_cc |  | 
| 
                  downgraded_disposition_notification_to |  | 
| 
                  downgraded_final_recipient |  | 
| 
                  downgraded_from |  | 
| 
                  downgraded_in_reply_to |  | 
| 
                  downgraded_mail_from |  | 
| 
                  downgraded_message_id |  | 
| 
                  downgraded_original_recipient |  | 
| 
                  downgraded_rcpt_to |  | 
| 
                  downgraded_references |  | 
| 
                  downgraded_reply_to |  | 
| 
                  downgraded_resent_bcc |  | 
| 
                  downgraded_resent_cc |  | 
| 
                  downgraded_resent_from |  | 
| 
                  downgraded_resent_reply_to |  | 
| 
                  downgraded_resent_sender |  | 
| 
                  downgraded_resent_to |  | 
| 
                  downgraded_return_path |  | 
| 
                  downgraded_sender |  | 
| 
                  downgraded_to |  | 
| 
                  ediint_features |  | 
| 
                  eesst_version |  | 
| 
                  encoding |  | 
| 
                  encrypted |  | 
| 
                  errors_to |  | 
| 
                  etag |  | 
| 
                  expect |  | 
| 
                  expires |  | 
| 
                  expiry_date |  | 
| 
                  ext |  | 
| 
                  followup_to |  | 
| 
                  forwarded |  | 
| 
                  from |  | 
| 
                  generate_delivery_report |  | 
| 
                  getprofile |  | 
| 
                  hobareg |  | 
| 
                  host |  | 
| 
                  http2_settings |  | 
| 
                  if_ |  | 
| 
                  if_match |  | 
| 
                  if_modified_since |  | 
| 
                  if_none_match |  | 
| 
                  if_range |  | 
| 
                  if_schedule_tag_match |  | 
| 
                  if_unmodified_since |  | 
| 
                  im |  | 
| 
                  importance |  | 
| 
                  in_reply_to |  | 
| 
                  incomplete_copy |  | 
| 
                  injection_date |  | 
| 
                  injection_info |  | 
| 
                  jabber_id |  | 
| 
                  keep_alive |  | 
| 
                  keywords |  | 
| 
                  label |  | 
| 
                  language |  | 
| 
                  last_modified |  | 
| 
                  latest_delivery_time |  | 
| 
                  lines |  | 
| 
                  link |  | 
| 
                  list_archive |  | 
| 
                  list_help |  | 
| 
                  list_id |  | 
| 
                  list_owner |  | 
| 
                  list_post |  | 
| 
                  list_subscribe |  | 
| 
                  list_unsubscribe |  | 
| 
                  list_unsubscribe_post |  | 
| 
                  location |  | 
| 
                  lock_token |  | 
| 
                  man |  | 
| 
                  max_forwards |  | 
| 
                  memento_datetime |  | 
| 
                  message_context |  | 
| 
                  message_id |  | 
| 
                  message_type |  | 
| 
                  meter |  | 
| 
                  method_check |  | 
| 
                  method_check_expires |  | 
| 
                  mime_version |  | 
| 
                  mmhs_acp127_message_identifier |  | 
| 
                  mmhs_authorizing_users |  | 
| 
                  mmhs_codress_message_indicator |  | 
| 
                  mmhs_copy_precedence |  | 
| 
                  mmhs_exempted_address |  | 
| 
                  mmhs_extended_authorisation_info |  | 
| 
                  mmhs_handling_instructions |  | 
| 
                  mmhs_message_instructions |  | 
| 
                  mmhs_message_type |  | 
| 
                  mmhs_originator_plad |  | 
| 
                  mmhs_originator_reference |  | 
| 
                  mmhs_other_recipients_indicator_cc |  | 
| 
                  mmhs_other_recipients_indicator_to |  | 
| 
                  mmhs_primary_precedence |  | 
| 
                  mmhs_subject_indicator_codes |  | 
| 
                  mt_priority |  | 
| 
                  negotiate |  | 
| 
                  newsgroups |  | 
| 
                  nntp_posting_date |  | 
| 
                  nntp_posting_host |  | 
| 
                  non_compliance |  | 
| 
                  obsoletes |  | 
| 
                  opt |  | 
| 
                  optional |  | 
| 
                  optional_www_authenticate |  | 
| 
                  ordering_type |  | 
| 
                  organization |  | 
| 
                  origin |  | 
| 
                  original_encoded_information_types |  | 
| 
                  original_from |  | 
| 
                  original_message_id |  | 
| 
                  original_recipient |  | 
| 
                  original_sender |  | 
| 
                  original_subject |  | 
| 
                  originator_return_address |  | 
| 
                  overwrite |  | 
| 
                  p3p |  | 
| 
                  path |  | 
| 
                  pep |  | 
| 
                  pep_info |  | 
| 
                  pics_label |  | 
| 
                  position |  | 
| 
                  posting_version |  | 
| 
                  pragma |  | 
| 
                  prefer |  | 
| 
                  preference_applied |  | 
| 
                  prevent_nondelivery_report |  | 
| 
                  priority |  | 
| 
                  privicon |  | 
| 
                  profileobject |  | 
| 
                  protocol |  | 
| 
                  protocol_info |  | 
| 
                  protocol_query |  | 
| 
                  protocol_request |  | 
| 
                  proxy_authenticate |  | 
| 
                  proxy_authentication_info |  | 
| 
                  proxy_authorization |  | 
| 
                  proxy_connection |  | 
| 
                  proxy_features |  | 
| 
                  proxy_instruction |  | 
| 
                  public_ |  | 
| 
                  public_key_pins |  | 
| 
                  public_key_pins_report_only |  | 
| 
                  range |  | 
| 
                  received |  | 
| 
                  received_spf |  | 
| 
                  redirect_ref |  | 
| 
                  references |  | 
| 
                  referer |  | 
| 
                  referer_root |  | 
| 
                  relay_version |  | 
| 
                  reply_by |  | 
| 
                  reply_to |  | 
| 
                  require_recipient_valid_since |  | 
| 
                  resent_bcc |  | 
| 
                  resent_cc |  | 
| 
                  resent_date |  | 
| 
                  resent_from |  | 
| 
                  resent_message_id |  | 
| 
                  resent_reply_to |  | 
| 
                  resent_sender |  | 
| 
                  resent_to |  | 
| 
                  resolution_hint |  | 
| 
                  resolver_location |  | 
| 
                  retry_after |  | 
| 
                  return_path |  | 
| 
                  safe |  | 
| 
                  schedule_reply |  | 
| 
                  schedule_tag |  | 
| 
                  sec_websocket_accept |  | 
| 
                  sec_websocket_extensions |  | 
| 
                  sec_websocket_key |  | 
| 
                  sec_websocket_protocol |  | 
| 
                  sec_websocket_version |  | 
| 
                  security_scheme |  | 
| 
                  see_also |  | 
| 
                  sender |  | 
| 
                  sensitivity |  | 
| 
                  server |  | 
| 
                  set_cookie |  | 
| 
                  set_cookie2 |  | 
| 
                  setprofile |  | 
| 
                  sio_label |  | 
| 
                  sio_label_history |  | 
| 
                  slug |  | 
| 
                  soapaction |  | 
| 
                  solicitation |  | 
| 
                  status_uri |  | 
| 
                  strict_transport_security |  | 
| 
                  subject |  | 
| 
                  subok |  | 
| 
                  subst |  | 
| 
                  summary |  | 
| 
                  supersedes |  | 
| 
                  surrogate_capability |  | 
| 
                  surrogate_control |  | 
| 
                  tcn |  | 
| 
                  te |  | 
| 
                  timeout |  | 
| 
                  title |  | 
| 
                  to |  | 
| 
                  topic |  | 
| 
                  trailer |  | 
| 
                  transfer_encoding |  | 
| 
                  ttl |  | 
| 
                  ua_color |  | 
| 
                  ua_media |  | 
| 
                  ua_pixels |  | 
| 
                  ua_resolution |  | 
| 
                  ua_windowpixels |  | 
| 
                  upgrade |  | 
| 
                  urgency |  | 
| 
                  uri |  | 
| 
                  user_agent |  | 
| 
                  variant_vary |  | 
| 
                  vary |  | 
| 
                  vbr_info |  | 
| 
                  version |  | 
| 
                  via |  | 
| 
                  want_digest |  | 
| 
                  warning |  | 
| 
                  www_authenticate |  | 
| 
                  x_archived_at |  | 
| 
                  x_device_accept |  | 
| 
                  x_device_accept_charset |  | 
| 
                  x_device_accept_encoding |  | 
| 
                  x_device_accept_language |  | 
| 
                  x_device_user_agent |  | 
| 
                  x_frame_options |  | 
| 
                  x_mittente |  | 
| 
                  x_pgp_sig |  | 
| 
                  x_ricevuta |  | 
| 
                  x_riferimento_message_id |  | 
| 
                  x_tiporicevuta |  | 
| 
                  x_trasporto |  | 
| 
                  x_verificasicurezza |  | 
| 
                  x400_content_identifier |  | 
| 
                  x400_content_return |  | 
| 
                  x400_content_type |  | 
| 
                  x400_mts_identifier |  | 
| 
                  x400_originator |  | 
| 
                  x400_received |  | 
| 
                  x400_recipients |  | 
| 
                  x400_trace |  | 
| 
                  xref |  |