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]