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ETSI TS V2.1.1 ( ) Technical Specification - PDF
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Georgiana Henry
1 TS V2.1.1 ( ) Technical Specification Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail (REM); Part 5: REM-MD Interoperability Profiles
2 2 TS V2.1.1 ( ) Reference DTS/ESI Keywords e-commerce, electronic signature, , security, trust services 650 Route des Lucioles F Sophia Antipolis Cedex - FRANCE Tel.: Fax: Siret N NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the version is the Portable Document Format (PDF). In case of dispute, the shall be the printing on printers of the PDF version kept on a specific network drive within Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other documents is available at If you find errors in the present document, please send your comment to one of the following services: Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute All rights reserved. DECT TM, PLUGTESTS TM, UMTS TM, TIPHON TM, the TIPHON logo and the logo are Trade Marks of registered for the benefit of its Members. 3GPP TM is a Trade Mark of registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mark of currently being registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association.
3 3 TS V2.1.1 ( ) Content Intellectual Property Rights... 4 Foreword... 4 Introduction Scope References Normative s Informative s Definitions General requirements Compliance requirements REM profile for SMTP interoperability Style of operation REM interfaces REM-MD Sender Message Submission Interface REM-MD Sender/Recipient Message Store Retrieval Interfaces REM-MD Repository Retrieval Interface REM Object Relay Interface REM-MD Envelope REM-MD Message/REM Dispatch Headers Constraints REM-MD Signature Headers Constraints REM-MD Introduction Headers Constraints Multipart/alternative: Free text subsection header constraints Multipart/alternative: Html subsection header constraints Original Message MIME Section headers constraints REM-MD Evidence MIME Section headers constraints REM-MD Extensions MIME Section headers constraints REM-MD evidence REM-MD Evidence types Mandatory evidence - all styles of operation Mandatory evidence - S&N style of operation Conditional evidence - all styles of operation REM-MD Evidence components SubmissionAcceptanceRejection - clause DeliveryNonDeliveryToRecipient - clause DownloadNonDownloadByRecipient - clause RelayToREMMDAcceptanceRejection - clause RelayToREMMDFailure - clause Annex A (informative): Bibliography History... 17
4 4 TS V2.1.1 ( ) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to. The information pertaining to these essential IPRs, if any, is publicly available for members and non-members, and can be found in SR : "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to in respect of standards", which is available from the Secretariat. Latest updates are available on the Web server ( Pursuant to the IPR Policy, no investigation, including IPR searches, has been carried out by. No guarantee can be given as to the existence of other IPRs not d in SR (or the updates on the Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by Technical Committee Electronic Signatures and Infrastructures (ESI). The present document is part 5 of a multi-part deliverable. Full details of the entire series can be found in part 1 [1]. Introduction Business and administrative relationships among companies, public administrations and private citizens, are the more and more implemented electronically. Trust is becoming essential for their success and continued development of electronic services. It is therefore important that any entity using electronic services have suitable security controls and mechanisms in place to protect their transactions and to ensure trust and confidence with their partners. Electronic mail is a major tool for electronic business and administration. Additional security services are necessary for to be trusted. At the time of writing the present document, in some European Union Member States (Italy, Belgium, etc.) regulation(s) and application(s) are being developed, if not already in place, on mails transmitted by electronic means providing origin authentication and proof of delivery. A range of Registered ("REM") services is already established and their number is set to grow significantly over the next few years. Without the definition of common standards there will be no consistency in the services provided, making it difficult for users to compare them. Under these circumstances, users might be prevented from easily changing to alternative providers, damaging free competition. Lack of standardization might also affect interoperability between REM based systems implemented based on different models. The present Technical Specification is to ensure a consistent form of service across Europe, especially with regard to the form of evidence provided, in order to maximize interoperability even between domains governed by different policy rules. In order to move towards the general recognition and readability of evidence provided by registered services, it is necessary to specify technical formats, as well as procedures and practices for handling REM, and the ways the electronic signatures are applied to it. In this respect, the electronic signature is an important security component to protect the information and to provide trust in electronic business. It is to be noted that a simple "electronic signature" would be insufficient to provide the required trust to an information exchange. Therefore the present Technical Specification assumes the usage of at least an Advanced Electronic Signature, with the meaning of article 2(2) of EU Directive 1999/93/EC [i.1] issued with a Secure Signature Creation Device, with the meaning of article 2(6) of the same Directive.
5 5 TS V2.1.1 ( ) 1 Scope The present document profiles the implementation of TS (REM TS) based systems, addressing issues relating to authentication, authenticity and integrity of the information to achieve interoperability between such systems. The present document covers all the options to profile REM-MD for both styles of operation: S&N and S&F. The mandatory requirements defined in the d REM TS are not repeated here but when necessary, the present document contains some s to them. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific, subsequent revisions do not apply. Non-specific may be made only to a complete document or a part thereof and only in the following cases: - if it is accepted that it will be possible to use all future changes of the d document for the purposes of the referring document; - for informative s. Referenced documents which are not found to be publicly available in the expected location might be found at NOTE: While any hyperlinks included in this clause were valid at the time of publication cannot guarantee their long term validity. 2.1 Normative s The following d documents are indispensable for the application of the present document. For dated s, only the edition cited applies. For non-specific s, the latest edition of the d document (including any amendments) applies. [1] TS : "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail (REM); Part 1: Architecture". [2] TS : "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail (REM); Part 2: requirements, Formats and Signatures for REM". [3] TS : "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail (REM); Part 3: Information Security Policy Requirements for REM Management Domains". [4] Void. [5] IETF RFC 3207 (2002): "SMTP Service Extension for Secure SMTP over Transport Layer Security". 2.2 Informative s The following d documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific s, the latest version of the d document (including any amendments) applies. [i.1] Directive 1999/93/EC of the European Parliament and of the Council of 13 December 1999 on a Community framework for electronic signatures.
6 6 TS V2.1.1 ( ) 3 Definitions For the purposes of the present document, the terms and definitions given in TS [1] apply. Throughout the present document a number of verbal forms are used, whose meaning is defined below: shall, shall not: indicate requirements strictly to be followed in order to conform to the present document and from which no deviation is permitted. should, should not: indicate that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required, or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. may, need not: indicate a course of action permissible within the limits of the present document. 4 General requirements This clause describes the tools and the formalities used for defining the profiles in the present document. 4.1 Compliance requirements Requirements are grouped in three different categories, each one having its corresponding identifier. Table 1 defines these categories and their identifiers. Table 1: Requirement categories Identifier M R O Requirement to implement System shall implement the element System should implement the element System may implement the element All the requirements will be defined in tabular form. Table 2: Requirements template Nº Service/Protocol element TS Requirement Implementation Column Nº will identify a unique number for the requirements. This number will start from 1 in each clause. The eventual s to it would also include the clause number to avoid any ambiguity. Column Service/Protocol element will identify the service element or protocol element the requirement applies to. Column TS Reference will the relevant clause of the standard where the element is defined. The is to TS [1], TS [2] or TS [3] except where explicitly indicated otherwise. Column Requirement will contain an identifier, as defined in table 1. Column Implementation will contain numbers referencing notes and/or letters referencing explanation of the requirement. It is intended either to explain how the requirement is implemented or to include any other information not mandatory. Column will contain additional notes to the requirement. NOTE: Within one REM-PD may be in force provision different from the ones specified in the present document, if and only if such REM-PD does not envisage to interoperate with other REM-PDs.
7 7 TS V2.1.1 ( ) 5 REM profile for SMTP interoperability This clause defines a profile for interoperability among REM-MDs based on SMTP relay protocol. 5.1 Style of operation From an interoperability standpoint, the style of operation adopted by a REM-MD (Store and Forward vs. Store and Notify) is foreseen to have no impact, so it is feasible to deal with both of them in a single profile. The reason for that lies in the fact that any REM-MD Message exchanged between two REM-MD (even REM-MD Messages that contain a to the REM Object in a Store-And-Notify context) is conveyed using the Relay Interface which, within the present interoperability profile, is based on the SMTP protocol. Henceforth protocols, message formats and evidence formats are the same in the two cases. Then all the Store-And-Notify systems also need a Store-And-Forward system that represents a common layer among the two styles of operations. Differences only arise in the set of mandatory evidence which are dealt with in the two styles of operations, as described in clause REM interfaces REM-MD Sender Message Submission Interface Nº Service/Protocol element 1 Any protocol provided that it is secured TS [1] Requirement Implementation Clause 5 M a Implementation : a) The Message Submission interface shall be implemented using any protocol securing the communication from the originating mail User Agent to the SMTP server. As an example SMTP on TLS or SSL may be used REM-MD Sender/Recipient Message Store Retrieval Interfaces Nº Service/Protocol element 1 Any protocol provided that it is secured TS [1] Requirement Implementation Clause 5 M a Implementation : a) The Message Store Retrieval interface shall be implemented using any protocol securing the communication from the sender/recipient mail User Agent to the REM-MD server. As an example IMAP or POP on TLS or SSL may be used REM-MD Repository Retrieval Interface Nº Service/Protocol element 1 Any protocol provided that it is secured TS [1] Requirement Implementation Clause 5 M a
8 8 TS V2.1.1 ( ) Implementation : a) The Repository Retrieval interface shall be implemented using any protocol securing the communication from the sender/recipient mail User Agent to the REM-MD server. As an example HTTP on SSL may be used (other common protocols like FTP and TLS for securing may be used and different agreements may exists between the involved REM-MDs) REM Object Relay Interface Nº Service/Protocol TS [1] Requirement Implementation element 1 SMTP on TLS Clause 5 M a see note NOTE: This is a profile for SMTP relay protocol among REM-MDs and it reflects in this requirement. Implementation : a) The Object Relay interface shall be implemented using SMTP protocol securing the communication from the sender REM-MD server to the recipient REM-MD server using TLS according to [5]. 5.3 REM-MD Envelope REM-MD Message/REM Dispatch Headers Constraints Nº Service/Protocol element TS [2] Requirement Implementation 1 X-REM-Msg-Type Clause 4.1 R a 2 X-REM-<component> Clause 4.1 R b Implementation : a) The headers list should contain a "X-REM-Msg-Type:" header specifying the type of the actual message. Its value will be either "Dispatch" for a REM Dispatch message or "Message" for a REM-MD. b) The headers list should contain at least three "X-REM-<component>:" headers specifying the following couples components/values: - X-REM-EvidenceIdentifier: <value1>: (i.e. G00 - REM-MD Evidence Identifier defined in clause of TS [2]). - X-REM-EvidenceType: <value2>: (i.e. G01 - REM-MD Evidence Type defined in clauses 5.1 of TS [2]). - X-REM-EventCode: <value3> (i.e. G02 - REM Event defined in clause of TS [2]). Where the values shall be filled respectively as: <value1> a string UID according to clause of TS [2]. <value2> one of the values of the string "name" specified in clause B.2 of TS [2] (e.g. SubmissionAcceptanceRejection, RelayToREMMDAcceptanceRejection, etc.). <value3> number representing the "eventcode" according to clause A.1.1 of TS [2]. NOTE: Items 1 and 2 facilitate achieving interoperability, that, however, may also be achieved without them.
9 9 TS V2.1.1 ( ) REM-MD Signature Headers Constraints Nº Service/Protocol element TS [2] Requirement Implementation 1 Content-Type Clause 4.3 M a 2 Content-Disposition Clause 4.3 M b Implementation : a) The Content-Type header field shall be present. The value of the header shall be "application/pkcs7-signature". An additional "name" parameter shall be provided that has the value "smime.p7s". b) The Content-Disposition field shall be present. The value of the header shall be "attachment". An additional "filename" parameter shall be provided that has the value "smime.p7s". Every REM-MD Message generated by a REM-MD shall include the field Content-Disposition and fill in the name/filename parameters. To maximize the level of interoperability the REM-MDs shall be able to correctly interpret incoming messages without the presence of Content-Disposition and/or name/filename parameters REM-MD Introduction Headers Constraints Nº Service/Protocol element TS [2] Requirement Implementation 1 X-REM-Section-Type Clause 4.4 M a Implementation : a) A X-REM-Section-Type header shall be provided that has the value "rem_message/introduction" Multipart/alternative: Free text subsection header constraints Nº Service/Protocol TS [2] Requirement Implementation element 1 Content-Type Clause R a Implementation : a) The value for this field shall be: "text/plain;". It also is recommended that this field assumes also the value charset="utf-8" Multipart/alternative: Html subsection header constraints Nº Service/Protocol TS [2] Requirement Implementation element 1 Content-Type Clause R a Implementation : a) The value for this field shall be: "text/html;". It also is recommended that this field assumes also the value charset="utf-8" Original Message MIME Section headers constraints Nº Service/Protocol element TS [2] Requirement Implementation 1 X-REM-Section-Type Clause 4.5 M a
10 10 TS V2.1.1 ( ) Implementation : a) A X-REM-Section-Type header shall be provided that has the value "rem_message/original" REM-MD Evidence MIME Section headers constraints Nº Service/Protocol element TS [2] Requirement Implementation 1 X-REM-Section-Type Clause 4.6 M a Implementation : a) A X-REM-Section-Type header shall be provided that has the value "rem_message/evidence". Nº Service/Protocol TS [2] Requirement Implementation element 2 Content-Type Clause M a Implementation : a) The value for this field shall be: "application/xml;" and name/charset fields shall assume the values specified in the TS [2]. The present profile requires that at least the evidence in XML format (defined in clause of TS [2]) is present in all the REM-MD messages. Optionally the PDF format, a defined in clause of TS [2], may be present. NOTE: If the optional evidence in PDF format carries an embedded XML structure, it shall replicate the data in the mandatory XML evidence REM-MD Extensions MIME Section headers constraints The present extension is optional and, when present, is contained in a XML attachment of the REM-MD Message. If it is present the following restrictions apply. Nº Service/Protocol element TS [2] Requirement Implementation 1 X-REM-Section-Type Clause 4.7 M a Implementation : a) A X-REM-Section-Type header shall be provided that has the value "rem_message/extensions". 5.4 REM-MD evidence REM-MD Evidence types Mandatory evidence - all styles of operation The following evidence types specified in the indicated TS [2] clauses are always required.
11 11 TS V2.1.1 ( ) Nº Service/Protocol element TS [2] Requirement Implementation 1 SubmissionAcceptanceRejection Clause M a see note 1 2 DeliveryNonDeliveryToRecipient Clause M b see note 2 NOTE 1: Rationale: The sender shall be aware of the successful/unsuccessful outcome of his/her message submission. NOTE 2: Rationale: The sender shall have evidence on whether the recipient was/was not delivered: - The original message he/she sent (where the sender's REM-MD style of operation is "S&F"). - The notification the sender's REM-MD generated in relation to the original message (where the sender's REM-MD style of operation is "S&N"). Implementation : a) The sender's REM-MD shall include the SubmissionAcceptanceRejection (obviously related to a successful submission) in the REM Dispatch(es) to be forwarded to the final recipient(s). b) The recipient's REM-MD shall send back to the sender one REM-MD Message including the DeliveryNonDeliveryToRecipient evidence Mandatory evidence - S&N style of operation The following evidence types specified in the indicated TS [2] clause is always required for messages conveyed to the recipient by. Nº Service/Protocol element TS [2] Requirement Implementation 1 DownloadNonDownloadByRecipient Clause M a see note NOTE: Rationale: The sender needs to have evidence on whether the recipient downloaded/non downloaded within a predefined time period the Original Message d in the notification. Implementation : a) The recipient's REM-MD shall send back to the sender one REM-MD Message including the DownloadNonDownloadByRecipient Conditional evidence - all styles of operation To the following evidence types, specified in the indicated TS [2] clauses, the below specified conditions apply. Nº Service/Protocol element TS [2] Requirement Implementation 1 RelayToREMMDAcceptanceRejection Clause Conditional "M" a, b, c see note 2 RelayToREMMDFailure Clause Conditional "M" d, e see note NOTE: Rationale for both evidence types: the sender needs to know if the sent message did not successfully reach, or was rejected by, the recipient's REM-MD, to enact possible backup measures. Implementation : a) Mandatory if: - no opposite provision is explicitly specified in the applicable REM-PD rules; - no previous opposite agreement exists between the involved REM-MDs. Such agreement or policy provision should specify one of the following: I) The sender's REM-MD will assume that one REM-MD Message has been rejected by the recipient's REM-MD if no contrary indication is received within a predefined time period. II) The sender's REM-MD will assume that one REM-MD Message has been accepted by the recipient's REM-MD if no contrary indication is received within a predefined time period.
12 12 TS V2.1.1 ( ) Alternative conditions may be specified in the above agreement, provided that the issue is exhaustively dealt with. b) If this Evidence type is mandatory, the recipient's REM-MD shall send back to the sender's REM-MD one REM-MD Message including the RelayToREMMDAcceptanceRejection. c) In the cases addressed in the previous item a)i) and item a)ii), the sender's REM-MD shall build a REM-MD Message, including one RelayToREMMDAcceptanceRejection Evidence and shall send it to the sender. d) Mandatory if no opposite requirement within REM-PD exists. Such policy requirement should specify that, if no contrary indication is received within a predefined time period, it is to be assumed that it was impossible to deliver one REM-MD Envelope within a given time period to the recipient's REM-MD, due to any kind of problems. Alternative conditions may be specified in the above policy, provided that the issue is exhaustively dealt with. e) The sender's REM-MD shall build a REM-MD Message, including one RelayToREMMDFailure Evidence and shall send it back to the sender REM-MD Evidence components In the following clauses, details on the Evidence Components are listed for each "Mandatory Evidence type" indicated in above clauses from through The line of conduct adopted in the following subclauses of this clause differs from the one adopted in the other clauses of the present document. More in detail, the following clauses list all Evidence Components that are required to ensure interoperability, including those that in TS [2] are already indicated as mandatory or whose absence implies a value by default. NOTE: This different line of conduct has been adopted to give a more complete and comfortable view to the reader SubmissionAcceptanceRejection - clause Nº Evidence element TS [2] Requirement Implementation 1 REM-MD Evidence Identifier G00 M see note 1 2 REM-MD Evidence Type = G01 M see note 1 "SubmissionAcceptanceRejection" 3 REM Event G02 M see note 1 4 Reason code G03 M (1..N) a see note 1 5 REM-MD Evidence Version G04 M see note 1 6 Event Time G05 M see note 1 7 REM-MD Evidence issuer Policy R01 M (1..N) see note 1 Identifier 8 REM-MD Evidence issuer Details R02 M see note 1 9 Sender's details I00 M see note 1 10 Recipient's details I01 M (1..N) see note 1 11 Sender Authentication details I04 O b see note 2 12 REM-MD Message/REM Dispatch M00 M see note 1 details 13 Reply-to M01 M c 14 Message Submission Time M03 M d NOTE 1: Readers are reminded that this requirement is present as mandatory in TS [2]. NOTE 2: Readers are reminded that this requirement is present with a default value in TS [2]. Implementation : a) At least one Reason Code shall be present, unless the applicable REM-PDs explicitly require that when submission is regularly accepted no Reason Code is necessary. Multiple Reason Code may be present depending on the found exceptions. b) If this field is not present it means that the class of authentication is Basic. In the other cases it specifies the class of Authentication.
13 13 TS V2.1.1 ( ) c) This field shall be present containing the address of the original sender, unless the applicable REM-PDs explicitly require that no Reply-to is necessary. d) This field shall be present DeliveryNonDeliveryToRecipient - clause Nº Evidence element TS [2] Requirement Implementation 1 REM-MD Evidence Identifier G00 M see note 2 REM-MD Evidence Type = G01 M see note "DeliveryNonDeliveryToRecipient" 3 REM Event G02 M see note 4 Reason code G03 M (1..N) a 5 REM-MD Evidence Version G04 M see note 6 Event Time G05 M see note 7 REM-MD Evidence issuer Policy R01 M (1..N) see note Identifier 8 REM-MD Evidence issuer Details R02 M see note 9 Sender's details I00 M see note 10 Recipient's details I01 M (1..N) see note 11 Recipient referred to by the Evidence I03 M b 12 REM-MD Message/REM Dispatch M00 M see note details 13 Notification Message Tag M02 O c NOTE: Readers are reminded that this requirement is present as mandatory in TS [2]. Implementation : a) At least one Reason Code shall be present, unless the applicable REM-PDs explicitly require that when delivery regularly occurred no Reason Code is necessary. Multiple Reason Code may be present depending on the found exceptions: b) This field shall be present. c) This field shall be present with value TRUE if the REM-MD Message to which this evidence refers is a notification. Otherwise, if this evidence refers to a REM-MD Message that includes the Original Message, it may be absent or assume the value FALSE DownloadNonDownloadByRecipient - clause Nº Evidence element TS [2] Requirement Implementation 1 REM-MD Evidence Identifier G00 M see note 2 REM-MD Evidence Type = G01 M see note "DownloadNonDownloadByRecipient" 3 REM Event G02 M see note 4 Reason code G03 M (1..N) a 5 REM-MD Evidence Version G04 M see note 6 Event Time G05 M see note 7 REM-MD Evidence issuer Policy Identifier R01 M (1..N) see note 8 REM-MD Evidence issuer Details R02 M see note 9 Sender's details I00 M see note 10 Recipient's details I01 M (1..N) see note 11 Recipient referred to by the Evidence I03 M b 12 Recipient Authentication details I05 O c 13 REM-MD Message/REM Dispatch details M00 M see note NOTE: Readers are reminded that this requirement is present as mandatory in TS [2].
14 14 TS V2.1.1 ( ) Implementation : a) At least one Reason Code shall be present, unless the applicable REM-PDs explicitly require that when download regularly occurred no Reason Code is necessary. Multiple Reason Code may be present depending on the found exceptions. b) This field shall be present. c) If this field is not present it means that the class of authentication is Basic. In the other cases it specifies the class of Authentication RelayToREMMDAcceptanceRejection - clause Nº Evidence element TS [2] Requirement Implementation 1 REM-MD Evidence Identifier G00 M see note 2 REM-MD Evidence Type = G01 M see note RelayToREMMDAcceptanceRejection 3 REM Event G02 M see note 4 Reason code G03 M (1..N) a 5 REM-MD Evidence Version G04 M see note 6 Event Time G05 M see note 7 REM-MD Evidence issuer Policy R01 M (1..N) see note Identifier 8 REM-MD Evidence issuer Details R02 M see note 10 Sender's details I00 M see note 11 Recipient's details I01 M (1..N) see note 12 Recipient referred to by the Evidence I03 M see note 13 REM-MD Message/REM Dispatch M00 M see note details 14 Notification Message Tag M02 M see note NOTE: Readers are reminded that this requirement is present as mandatory in TS [2]. Implementation : a) At least one Reason Code shall be present, unless the applicable REM-PDs explicitly require that when the relay to the recipient's REM-MD regularly occurred no Reason Code is necessary. Multiple Reason Code may be present depending on the found exceptions RelayToREMMDFailure - clause Nº Evidence element TS [2] Requirement Implementation 1 REM-MD Evidence Identifier G00 M see note 2 REM-MD Evidence Type = G01 M see note "RelayToREMMDFailure" 3 REM Event G02 M see note 4 Reason code G03 M (1..N) a 5 REM-MD Evidence Version G04 M see note 6 Event Time G05 M see note 7 REM-MD Evidence issuer Policy R01 M (1..N) see note Identifier 8 REM-MD Evidence issuer Details R02 M see note 9 Sender's details I00 M see note 11 Recipient's details I01 M (1..N) see note 12 Recipient referred to by the Evidence I03 M see note 13 REM-MD Message/REM Dispatch M00 M see note details 14 Notification Message Tag M02 M see note NOTE: Readers are reminded that this requirement is present as mandatory in TS [2].
15 15 TS V2.1.1 ( ) Implementation : a) At least one Reason Code shall be present, unless the applicable REM-PDs explicitly require that when relay to the recipient's REM-MD failed no Reason Code is necessary. Multiple Reason Code may be present depending on the found exceptions.
16 16 TS V2.1.1 ( ) Annex A (informative): Bibliography TS : "Electronic Signatures and Infrastructures (ESI); Registered Electronic Mail (REM); Part 4: REM-MD Conformance Profiles".
17 17 TS V2.1.1 ( ) History Document history V2.1.1 January 2010 Publication