| Member | Value | Description |
|---|---|---|
| msgAlsoControl | 1 | "Also-Control:" |
| msgAlternateRecipient | 2 | "Alternate-Recipient:" |
| msgApparentlyTo | 3 | "Apparently-To:" |
| msgApproved | 4 | "Approved:" |
| msgArticleNames | 5 | "Article-Names:" |
| msgArticleUpdates | 6 | "Article-Updates:" |
| msgAutoForwarded | 7 | "Auto-Forwarded:" |
| msgComments | 8 | "Comments:" |
| msgContentBase | 9 | "Content-Base:" |
| msgContentConversion | 10 | "Content-Conversion:" |
| msgContentDescription | 11 | "Content-Description:" |
| msgContentDisposition | 12 | "Content-Disposition:" |
| msgContentID | 13 | "Content-ID:" |
| msgContentIdentifier | 14 | "Content-Identifier:" |
| msgContentLanguage | 15 | "Content-Language:" |
| msgContentLength | 16 | "Content-Length:" |
| msgContentLocation | 17 | "Content-Location:" |
| msgContentMD5 | 18 | "Content-MD5:" |
| msgContentReturn | 19 | "Content-Return:" |
| msgContentSGMLEntity | 20 | "Content-SGML-Entity:" |
| msgContentTransferEncoding | 21 | "Content-Transfer-Encoding:" |
| msgContentType | 22 | "Content-Type:" |
| msgControl | 23 | "Control:" |
| msgConversion | 24 | "Conversion:" |
| msgConversionWithLoss | 25 | "Conversion-With-Loss:" |
| msgDate | 26 | "Date:" |
| msgDeliveryDate | 27 | "Delivery-Date:" |
| msgDeliveryReport | 28 | "Delivery-Report:" |
| msgDiscardedX400IPMSExtensions | 29 | "Discarded-X400-IPMS-Extensions:" |
| msgDiscardedX400MTSExtensions | 30 | "Discarded-X400-MTS-Extensions:" |
| msgDiscloseRecipients | 31 | "Disclose-Recipients:" |
| msgDistribution | 32 | "Distribution:" |
| msgDLExpansionHistoryIndication | 33 | "DL-Expansion-History-Indication:" |
| msgEncoding | 34 | "Encoding:" |
| msgErrorsTo | 35 | "Errors-To:" |
| msgExpires | 36 | "Expires:" |
| msgFax | 37 | "Fax:" |
| msgFcc | 38 | "Fcc:" |
| msgFollowupTo | 39 | "Followup-To:" |
| msgForComment | 40 | "For-Comment:" |
| msgForHandling | 41 | "For-Handling:" |
| msgFrom | 42 | "From:" |
| msgGenerateDeliveryReport | 43 | "Generate-Delivery-Report:" |
| msgImportance | 44 | "Importance:" |
| msgIncompleteCopy | 47 | "In-Reply-To:" |
| msgInReplyTo | 46 | "Incomplete-Copy:" |
| msgKeywords | 48 | "Keywords:" |
| msgLanguage | 49 | "Language:" |
| msgLines | 50 | "Lines:" |
| msgMailer | 52 | "Mailer:" |
| msgMailSystemVersion | 51 | "Mail-System-Version:" |
| msgMessageID | 53 | "Message-ID" |
| msgMessageType | 54 | "Message-Type:" |
| msgMIMEVersion | 55 | "MIME-Version:" |
| msgNewsgroups | 56 | "Newsgroups:" |
| msgNull | 0 | N/A |
| msgObsoletes | 57 | "Obsoletes:" |
| msgOrganisation | 58 | "Organisation:" |
| msgOrganization | 59 | "Organization:" |
| msgOriginalEncodedInformationTypes | 60 | "Original-Encoded-Information-Types:" |
| msgOriginatingClient | 61 | "Originating-Client:" |
| msgPath | 62 | "Path:" |
| msgPhone | 63 | "Phone:" |
| msgPrecedence | 64 | "Precedence:" |
| msgPreventNonDeliveryReport | 65 | "Prevent-NonDelivery-Report:" |
| msgPriority | 66 | "Priority:" |
| msgReceived | 67 | "Received:" |
| msgReferences | 68 | "References:" |
| msgReplyBy | 69 | "Reply-By:" |
| msgReplyTo | 70 | "Reply-To:" |
| msgReturnPath | 72 | "Return-Path:" |
| msgReturnReceiptTo | 73 | "Return-Receipt-To:" |
| msgSeeAlso | 74 | "See-Also:" |
| msgSender | 75 | "Sender:" |
| msgSensitivity | 76 | "Sensitivity:" |
| msgStatus | 77 | "Status:" |
| msgSubject | 78 | "Subject:" |
| msgSummary | 79 | "Summary:" |
| msgSupersedes | 80 | "Supersedes:" |
| msgTelefax | 81 | "Telefax:" |
| msgX400ContentReturn | 82 | "X400-Content-Return:" |
| msgXMailer | 84 | "X-Mailer:" |
| msgXNewsreader | 85 | "X-Newsreader:" |
| msgXref | 86 | "Xref:" |