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E-mail Header Fields

The data here is preliminary, it was imported from a list by G. Klyne. Not all data is currently visible. This will be improved in time. (Source and Copyright notice).

See also "Registration Procedures for Message Header Fields" (RFC3864) and the initial IANA registration for permanent mail and MIME message header fields (RFC4021).

Accept-Language Alternate-Recipient Autoforwarded Autosubmitted Bcc Cc Comments Content-Identifier Content-Return Conversion Conversion-With-Loss DL-Expansion-History Date Deferred-Delivery Delivery-Date Discarded-X400-IPMS-Extensions Discarded-X400-MTS-Extensions Disclose-Recipients Disposition-Notification-Options Disposition-Notification-To Encoding Encrypted Expires Expiry-Date From Generate-Delivery-Report Importance In-Reply-To Incomplete-Copy Keywords Language Latest-Delivery-Time List-Archive List-Help List-ID List-Owner List-Post

List-Subscribe List-Unsubscribe Message-Context Message-ID Message-Type Obsoletes Original-Encoded-Information-Types Original-Message-ID Originator-Return-Address PICS-Label Prevent-NonDelivery-Report Priority Received References Reply-By Reply-To Resent-Bcc Resent-Cc Resent-Date Resent-From Resent-Message-ID Resent-Reply-To Resent-Sender Resent-To Return-Path Sender Sensitivity Subject Supersedes To X400-Content-Identifier X400-Content-Return X400-Content-Type X400-MTS-Identifier X400-Originator X400-Received X400-Recipients X400-Trace