Internet Assigned Numbers Authority
Message Headers
Last Updated
2025-08-25
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
Plain text
Registries Included Below
??Permanent Message Header Field Names
??Provisional Message Header Field Names
??Content-Translation-Type Header Field Values
Permanent Message Header Field Names
Registration Procedure(s)
Expert Review
Expert(s)
Mark Baker (primary), Murray Kucherawy (backup)
Reference
[RFC3864][RFC-ietf-emailcore-rfc5322bis-12]
Note
[RFC5504] specified that no new header fields be registered that begin with "Downgraded-".
That restriction is now lifted, per [RFC6857].
Note
HTTP field name registrations have been moved to [https://www.iana.org/assignments/http-fields]
per [RFC9110].
Available Formats
[IMG]
CSV
Header Field Name Template Protocol Status Trace Reference
Accept-Language mail [RFC4021]
Also-Control netnews obsoleted [RFC1849][RFC5536]
Alternate-Recipient mail [RFC4021]
Approved netnews standard [RFC5536]
ARC-Authentication-Results mail experimental [RFC8617]
ARC-Message-Signature mail experimental [RFC8617]
ARC-Seal mail experimental [RFC8617]
Archive netnews standard [RFC5536]
Archived-At mail standard [RFC5064]
Archived-At netnews standard [RFC5064]
Article-Names netnews obsoleted [RFC1849][RFC5536]
Article-Updates netnews obsoleted [RFC1849][RFC5536]
Authentication-Results mail standard [RFC8601]
Auto-Submitted mail standard [RFC3834 section 5]
Autoforwarded mail [RFC4021]
Autosubmitted mail [RFC4021]
Base MIME obsoleted [RFC1808][RFC2068 Section 14.11]
Bcc mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.3]
Body none reserved [RFC6068]
Cancel-Key netnews standard [RFC8315]
Cancel-Lock netnews standard [RFC8315]
Cc mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.3]
Comments mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.5]
Comments netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Content-Alternative MIME [RFC4021]
Content-Base MIME obsoleted [RFC2110][RFC2557]
Content-Description MIME [RFC4021]
Content-Disposition MIME [RFC4021]
Content-Duration MIME [RFC4021]
Content-features MIME [RFC4021]
Content-ID MIME [RFC4021]
Content-Identifier mail [RFC4021]
Content-Language MIME [RFC4021]
Content-Location MIME [RFC4021]
Content-MD5 MIME [RFC4021]
Content-Return mail [RFC4021]
Content-Transfer-Encoding MIME [RFC4021]
Content-Translation-Type MIME standard [RFC8255]
Content-Type MIME [RFC4021][RFC9788]
Control netnews standard [RFC5536]
Conversion mail [RFC4021]
Conversion-With-Loss mail [RFC4021]
DL-Expansion-History mail [RFC4021]
Date mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.1]
Date netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Date-Received netnews obsoleted [RFC850][RFC5536]
Deferred-Delivery mail [RFC4021]
Delivery-Date mail [RFC4021]
Discarded-X400-IPMS-Extensions mail [RFC4021]
Discarded-X400-MTS-Extensions mail [RFC4021]
Disclose-Recipients mail [RFC4021]
Disposition-Notification-Options mail [RFC4021]
Disposition-Notification-To mail [RFC4021]
Distribution netnews standard [RFC5536]
DKIM-Signature mail standard [RFC6376]
Downgraded-Bcc mail obsoleted [RFC5504][RFC6857]
Downgraded-Cc mail obsoleted [RFC5504][RFC6857]
Downgraded-Disposition-Notification-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Final-Recipient mail standard [RFC6857 Section 3.1.10]
Downgraded-From mail obsoleted [RFC5504][RFC6857 Section 3.1.10]
Downgraded-In-Reply-To mail standard [RFC6857 Section 3.1.10]
Downgraded-Mail-From mail obsoleted [RFC5504][RFC6857 Section 3.1.10]
Downgraded-Message-Id mail standard [RFC6857 Section 3.1.10]
Downgraded-Original-Recipient mail standard [RFC6857 Section 3.1.10]
Downgraded-Rcpt-To mail obsoleted [RFC5504][RFC6857]
Downgraded-References mail standard [RFC6857 Section 3.1.10]
Downgraded-Reply-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Bcc mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Cc mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-From mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Reply-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Sender mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Return-Path mail obsoleted [RFC5504][RFC6857]
Downgraded-Sender mail obsoleted [RFC5504][RFC6857]
Downgraded-To mail obsoleted [RFC5504][RFC6857]
Encoding mail [RFC4021]
Encrypted mail [RFC4021]
Expires mail [RFC4021]
Expires netnews standard [RFC5536]
Expiry-Date mail [RFC4021]
Followup-To netnews standard [RFC5536]
From mail standard no [RFC6854][RFC-ietf-emailcore-rfc5322bis-12, 3.6.2]
From netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Generate-Delivery-Report mail [RFC4021]
HP-Outer mail standard [RFC9788 Section 2.2.1]
Importance mail [RFC4021]
In-Reply-To mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.4]
Incomplete-Copy mail [RFC4021]
Injection-Date netnews standard [RFC5536]
Injection-Info netnews standard [RFC5536]
Keywords mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.5]
Keywords netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Language mail [RFC4021]
Latest-Delivery-Time mail [RFC4021]
Lines netnews deprecated [RFC5536][RFC3977]
List-Archive mail [RFC4021]
List-Help mail [RFC4021]
List-ID mail [RFC4021]
List-Owner mail [RFC4021]
List-Post mail [RFC4021]
List-Subscribe mail [RFC4021]
List-Unsubscribe perm/list-unsubscribe mail [RFC4021]
List-Unsubscribe-Post mail standard [RFC8058]
Message-Context mail [RFC4021]
Message-ID mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.4]
Message-ID netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Message-Type mail [RFC4021]
MIME-Version MIME [RFC4021]
MMHS-Exempted-Address mail [RFC6477][ACP123 Appendix A1.1 and Appendix B.105]
MMHS-Extended-Authorisation-Info mail [RFC6477][ACP123 Appendix A1.2 and Appendix B.106]
MMHS-Subject-Indicator-Codes mail [RFC6477][ACP123 Appendix A1.3 and Appendix B.107]
MMHS-Handling-Instructions mail [RFC6477][ACP123 Appendix A1.4 and Appendix B.108]
MMHS-Message-Instructions mail [RFC6477][ACP123 Appendix A1.5 and Appendix B.109]
MMHS-Codress-Message-Indicator mail [RFC6477][ACP123 Appendix A1.6 and Appendix B.110]
MMHS-Originator-Reference mail [RFC6477][ACP123 Appendix A1.7 and Appendix B.111]
MMHS-Primary-Precedence mail [RFC6477][ACP123 Appendix A1.8 and Appendix B.101]
MMHS-Copy-Precedence mail [RFC6477][ACP123 Appendix A1.9 and Appendix B.102]
MMHS-Message-Type mail [RFC6477][ACP123 Appendix A1.10 and Appendix B.103]
MMHS-Other-Recipients-Indicator-To mail [RFC6477][ACP123 Appendix A1.12 and Appendix B.113]
MMHS-Other-Recipients-Indicator-CC mail [RFC6477][ACP123 Appendix A1.12 and Appendix B.113]
MMHS-Acp127-Message-Identifier mail [RFC6477][ACP123 Appendix A1.14 and Appendix B.116]
MMHS-Originator-PLAD mail [RFC6477][ACP123 Appendix A1.15 and Appendix B.117]
MT-Priority mail standard [RFC6758]
Newsgroups netnews standard [RFC5536]
NNTP-Posting-Date netnews obsoleted [RFC5536]
NNTP-Posting-Host netnews obsoleted [RFC2980][RFC5536]
Obsoletes mail [RFC4021]
Organization mail informational [RFC7681]
Organization netnews standard [RFC5536]
Original-Encoded-Information-Types mail [RFC4021]
Original-From mail standard [RFC5703]
Original-Message-ID mail [RFC4021]
Original-Recipient perm/original-recipient mail standard [RFC3798][RFC5337]
Original-Sender netnews standard [RFC5537]
Originator-Return-Address mail [RFC4021]
Original-Subject mail standard [RFC5703]
Path netnews standard [RFC5536]
PICS-Label mail [RFC4021]
Posting-Version netnews obsoleted [RFC850][RFC5536]
Prevent-NonDelivery-Report mail [RFC4021]
Priority mail [RFC4021]
Received mail standard yes [RFC-ietf-emailcore-rfc5322bis-12,
3.6.7][RFC-ietf-emailcore-rfc5321bis-43]
Received-SPF mail standard [RFC7208]
References mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.4]
References netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Relay-Version netnews obsoleted [RFC850][RFC5536]
Reply-By mail [RFC4021]
Reply-To mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.2]
Reply-To netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Require-Recipient-Valid-Since mail standard [RFC7293]
Resent-Bcc mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Resent-Cc mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Resent-Date mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Resent-From mail standard no [RFC6854][RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Resent-Message-ID mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Resent-Reply-To mail obsoleted no [RFC-ietf-emailcore-rfc5322bis-12, 4.5.6]
Resent-Sender mail standard no [RFC6854][RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Resent-To mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.6]
Return-Path mail standard yes [RFC-ietf-emailcore-rfc5322bis-12,
3.6.7][RFC-ietf-emailcore-rfc5321bis-43]
See-Also netnews obsoleted [RFC1849][RFC5536]
Sender mail standard no [RFC6854][RFC-ietf-emailcore-rfc5322bis-12, 3.6.2]
Sender netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Sensitivity mail [RFC4021]
Solicitation mail [RFC3865]
Subject mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.5]
Subject netnews standard [RFC5536][RFC-ietf-emailcore-rfc5322bis-12]
Summary netnews standard [RFC5536]
Supersedes mail [RFC4021]
Supersedes netnews standard [RFC5536][RFC2156]
TLS-Report-Domain mail standard [RFC8460]
TLS-Report-Submitter mail standard [RFC8460]
TLS-Required mail standard [RFC8689]
To mail standard no [RFC-ietf-emailcore-rfc5322bis-12, 3.6.3]
User-Agent netnews standard [RFC5536][RFC2616]
VBR-Info mail standard [RFC5518]
X400-Content-Identifier mail [RFC4021]
X400-Content-Return mail [RFC4021]
X400-Content-Type mail [RFC4021]
X400-MTS-Identifier mail [RFC4021]
X400-Originator mail [RFC4021]
X400-Received mail [RFC4021]
X400-Recipients mail [RFC4021]
X400-Trace mail [RFC4021]
Xref netnews standard [RFC5536]
Provisional Message Header Field Names
Registration Procedure(s)
Expert Review
Expert(s)
Mark Baker (primary), Murray Kucherawy (backup)
Reference
[RFC3864][RFC-ietf-emailcore-rfc5322bis-12]
Note
Registration of a Provisional Message Header Field does not of itself imply any kind of
endorsement by the IETF, IANA or any other body.
Note
HTTP field name registrations have been moved to [https://www.iana.org/assignments/http-fields]
per [RFC9110].
Available Formats
[IMG]
CSV
Header Field Name Template Protocol Status Trace Reference
Apparently-To prov/apparently-to mail [RFC2076]
Author mail [RFC9057]
CFBL-Address mail [RFC9477]
CFBL-Feedback-ID mail [RFC9477]
Delivered-To mail [RFC9228]
EDIINT-Features mail [RFC6017]
Eesst-Version mail [RFC7681]
Errors-To prov/errors-to mail [RFC2076]
Face prov/face mail [https://quimby.gnus.org/circus/face]
Face prov/face netnews [https://quimby.gnus.org/circus/face]
Form-Sub mail [draft-levine-mailbomb-header-00]
Jabber-ID prov/jabber-id mail [RFC7259]
Jabber-ID prov/jabber-id netnews [RFC7259]
MMHS-Authorizing-Users mail [RFC7912]
Privicon mail [draft-koenig-privicons-01]
SIO-Label mail [RFC7444]
SIO-Label-History mail [RFC7444]
Wrong-Recipient prov/wrong-recipient mail [draft-ietf-mailmaint-wrong-recipient-00]
X-Archived-At prov/x-archived-at mail deprecated [RFC5064]
X-Archived-At prov/x-archived-at netnews deprecated [RFC5064]
X-Face prov/x-face mail [https://purl.org/x-face-spec]
X-Face prov/x-face netnews [https://purl.org/x-face-spec]
X-Mittente mail [RFC6109]
X-PGP-Sig prov/x-pgp-sig netnews [ftp://ftp.isc.org/pub/pgpcontrol/FORMAT][https://ftp.isc.org/pub/pgpcontrol/FORMAT]
X-Ricevuta mail [RFC6109]
X-Riferimento-Message-ID mail [RFC6109]
X-TipoRicevuta mail [RFC6109]
X-Trasporto mail [RFC6109]
X-VerificaSicurezza mail [RFC6109]
Content-Translation-Type Header Field Values
Registration Procedure(s)
Specification Required
Expert(s)
Nik Tomkinson
Reference
[RFC8255]
Available Formats
[IMG]
CSV
Value Description Reference
original Content in the original language [RFC8255]
human Content that has been translated by a human translator or a human has checked and corrected an automated translation [RFC8255]
automated Content that has been translated by an electronic agent without proofreading or subsequent correction [RFC8255]
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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