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/F0 12/Courier@0 SF(Network Working Group)56.692 84.944 Q(B. Lilly)309.6
E 338.4(Internet\255Draft March)56.692 96.944 R(2005)7.2 E
(Updates: 822, 2822 \(if approved\))56.692 108.944 Q
(Intended status: Standards Track)56.692 120.944 Q
(Expires: September 15, 2005)56.692 132.944 Q
(Message Header From Field Made Optional)175.492 156.944 Q 215.092
168.944 EBEGIN
[/Author (B. Lilly) /Title (Message Header From Field Made Optional) /DOCINFO pdfmark
EEND/F0 12/Courier@0 SF(draft\255lilly\255from\255optional\25502)215.092
168.944 Q(Status of this Memo)56.692 192.944 Q
(By submitting this Internet\255Draft, the author represents that any)
78.292 216.944 Q
(applicable patent or other IPR claims of which he is aware have been)
78.292 228.944 Q
(or will be disclosed, and any of which he becomes aware will be)78.292
240.944 Q(disclosed, in accordance with Section 6 of BCP 79.)78.292
252.944 Q
(Internet\255Drafts are working documents of the Internet Engineering)
78.292 276.944 Q
(Task Force \(IETF\), its areas, and its working groups.)78.292 288.944
Q(Note that)14.4 E
(other groups may also distribute working documents as)78.292 300.944 Q
(Internet\255Drafts.)78.292 312.944 Q(Internet\255Drafts are draft docu\
ments valid for a maximum of six months)78.292 336.944 Q
(and may be updated, replaced, or obsoleted by other documents at any)
78.292 348.944 Q 7.2(time. It)78.292 360.944 R
(is inappropriate to use Internet\255Drafts as reference)7.2 E
(material or to cite them other than as "work in progress.")78.292
372.944 Q(The list of current Internet\255Drafts can be accessed at)
78.292 396.944 Q(http://www.ietf.org/ietf/1id\255abstracts.txt.)78.292
408.944 Q
(The list of Internet\255Draft Shadow Directories can be accessed at)
78.292 432.944 Q(http://www.ietf.org/shadow.html.)78.292 444.944 Q
(Copyright Notice)56.692 468.944 Q 7.2(Copyright \251 The)78.292 492.944
R(Internet Society \(2005\).)7.2 E(Abstract)56.692 516.944 Q
(The requirement for the presence of a syntactically\255valid message)
78.292 540.944 Q
(header From field in the Internet Message Format presents a problem)
78.292 552.944 Q(in some circumstances.)78.292 564.944 Q
(This memo \(if approved\) amends the Internet)14.4 E
(Message Format specifications to make that field optional.)78.292
576.944 Q
(Discussion of the subject matter covered in this memo has taken place)
78.292 588.944 Q(on the ietf\255822 mailing list, and that would be a s\
uitable place for)78.292 600.944 Q(discussion of this document.)78.292
612.944 Q 56.692 636.944 EBEGIN
[/Title (1. Introduction) /Dest (S1.) /OUT pdfmark
EEND 56.692 636.944 EBEGIN
[/Dest (S1.) /Page 1 /View [ /FitH 192 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(1. Introduction)56.692 636.944 Q
(The Internet Message Format specification [N1.STD11], [N2.RFC2822])
78.292 660.944 Q
(requires a From field in the message header with a field body)78.292
672.944 Q(consisting of a non\255empty list of mailboxes for the messag\
e authors.)78.292 684.944 Q
(There are at least two situations where such a list is not practical:)
78.292 696.944 Q 14.4(a. The)78.292 720.944 R
(author has no mailbox \([N1.STD11] example A.2.6 uses the)7.2 E
(sender's mailbox and associates it with a display name different)
114.292 732.944 Q
(from that of the true sender, which may lead to confusion\).)114.292
744.944 Q 122.4(Lilly Expires)56.692 768.944 R(September 15, 2005)7.2 E
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/F0 12/Courier@0 SF 64.8(Internet\255Draft From)20.182 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E
([N2.RFC2822] section 3.6.2 states that the [N1.STD11] A.2.6)77.782
108.944 Q
(practice of using a mailbox other than the author's is strongly)77.782
120.944 Q(deprecated, but does not offer a viable alternative.)77.782
132.944 Q 14.4(b. The)41.782 156.944 R
(author or authors require anonymity \(e.g. whistle\255blowing or)7.2 E
(political dissidence\))77.782 168.944 Q
(The fundamental problem is that the Message Format specification)41.782
192.944 Q(requires supplying information which in some circumstances is)
41.782 204.944 Q
(unavailable, and in other circumstances may be harmful, even lethal.)
41.782 216.944 Q
(Several approaches to resolving the problem have been considered:)
41.782 228.944 Q 14.4(a. As)41.782 252.944 R
(mentioned, the [N1.STD11] example A.2.6 method may lead to)7.2 E
(confusion; worse, use of a mailbox for someone other than the)77.782
264.944 Q(message author may result in harm to an individual or group)
77.782 276.944 Q(unrelated to the message.)77.782 288.944 Q 14.4(b. One)
41.782 312.944 R
(might use a syntactically valid but unresolvable domain name)7.2 E
(in the mailbox; however, that interacts badly with gateways)77.782
324.944 Q
([I1.RFC2821] to non\255Internet mail and non\255mail systems \(where)
77.782 336.944 Q
(DNS might not be available to the recipient\), it is not always)77.782
348.944 Q
(easy to distinguish an unresolvable name from temporary failure)77.782
360.944 Q(or, worse, deliberate return of inappropriate response codes)
77.782 372.944 Q
(from a name server [I2.SiteFinder], and if used widely might)77.782
384.944 Q(result in unreasonable load on the root nameservers.)77.782
396.944 Q 14.4(c. A)41.782 420.944 R
(domain literal corresponding to no location might be used.)7.2 E
(That would avoid DNS issues.)77.782 432.944 Q
(Unfortunately, there is no IPv4)14.4 E
(address that guarantees that characteristic [I3.RFC3330].)77.782
444.944 Q(There)14.4 E
(is an IPv6 address range reserved for documentation)77.782 456.944 Q
7.2([I4.RFC3849]. There)77.782 468.944 R
(have in the past been other reserved ranges)7.2 E 7.2
([I5.RFC3701]. Finally,)77.782 480.944 R
(there are a few other reserved IPv6)7.2 E
(addresses as specified in [I6.RFC3513].)77.782 492.944 Q
(In particular, the)14.4 E
([I6.RFC3513] "Unspecified" IPv6 address is potentially useful.)77.782
504.944 Q(Unfortunately, there are several problems with IPv6 domain)
63.382 528.944 Q(literals:)63.382 540.944 Q 14.4(i. IPv6)63.382 564.944
R(is not yet widely deployed)7.2 E 7.2(ii. In)63.382 588.944 R
(particular, there does not appear to be widely\255deployed)7.2 E
(recognition of [I1.RFC2821] \(as referenced by [N2.RFC2822]\))99.382
600.944 Q(tagged IPv6 domain literals.)99.382 612.944 Q
(One [I1.RFC2821] representation)14.4 E
(of the [I6.RFC3513] "Unspecified" IPv6 address is)99.382 624.944 Q 7.2
("[IPv6:0::]". Many)99.382 636.944 R
(implementations expect domain literals to)7.2 E
(conform to the \(untagged\) IPv4 syntax of [I7.STD3])99.382 648.944 Q
(iii. Domain literals are essentially opaque to end users.)63.382
672.944 Q(They do)14.4 E
(not convey the desired semantics \(lack of an Internet mailbox)99.382
684.944 Q(or anonymity\).)99.382 696.944 Q 7.2(iv. There)63.382 720.944
R(are literally dozens of distinct but equivalent)7.2 E
([I1.RFC2821] tagged IPv6 representations of the "Unspecified")99.382
732.944 Q(IPv6 domain literal.)99.382 744.944 Q
(That makes it difficult to educate end)14.4 E 122.4(Lilly Expires)
20.182 768.944 R(September 15, 2005)7.2 E([Page 2])108 E 0 Cg EP
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/F0 12/Courier@0 SF 64.8(Internet\255Draft From)56.692 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E
(users about the semantics, since an end user might encounter)135.892
108.944 Q(any of many distinct representations.)135.892 120.944 Q 14.4
(v. There)99.892 144.944 R
(is potential for interoperability problems: one type of)7.2 E
([I6.RFC3513] IPv6 address with embedded IPv4 address has the)135.892
156.944 Q(IPv4 address \(32 bits\) in an otherwise zero-valued IPv6)
135.892 168.944 Q 7.2(address. The)135.892 180.944 R
("Unspecified" IPv6 might mistakenly be)7.2 E
(interpreted as an embedded IPv4 address of 0.0.0.0, which has)135.892
192.944 Q(semantics of "this" host on "this" network [I3.RFC3330], i.e.)
135.892 204.944 Q(similar to the loopback semantics.)135.892 216.944 Q
(Any local\255part used with)14.4 E
(that IPv6 "Unspecified" literal so interpreted might clash)135.892
228.944 Q
(with a valid local\255part on the local system, which is hardly)135.892
240.944 Q(equivalent to the desired semantics of no Internet mailbox or)
135.892 252.944 Q(anonymity.)135.892 264.944 Q
(Use of either a domain name or domain literal raises the issue of)
99.892 288.944 Q 7.2(as)99.892 300.944 S
(uitable local\255part, and the issues with respect to)-7.2 E
(interpretation of such a local\255part.)99.892 312.944 Q
(Hosts are supposed to treat)14.4 E
(local\255parts as opaque strings unless the domain matches the host's)
99.892 324.944 Q
(domain \(which would never be the case for an unassigned domain)99.892
336.944 Q(name or "unspecified" domain literal\).)99.892 348.944 Q 7.2
(Af)99.892 372.944 S
(ield body syntax change would be a problem for SMTP gateways,)-7.2 E
(which are required to ensure that address fields contain content)99.892
384.944 Q
(which is "effective and useful for sending replies" as specified)99.892
396.944 Q(in [I1.RFC2821].)99.892 408.944 Q 14.4(d. The)78.292 432.944 R
(syntax of the From field might be changed to permit an empty)7.2 E
(field body, i.e. zero or more mailboxes.)114.292 444.944 Q
(While the Bcc field)14.4 E
(has provision for an empty field body, the From field does not.)114.292
456.944 Q(Such a change would be incompatible with modern and past)
114.292 468.944 Q
(implementations, as an empty From field body has never been)114.292
480.944 Q(legal.)114.292 492.944 Q
(An empty field body presents problems for SMTP gateways, as noted)
99.892 516.944 Q 7.2(above. It)99.892 528.944 R
(may also present problems for other protocols using)7.2 E
(RFC 822 syntax, as noted below.)99.892 540.944 Q 14.4(e. The)78.292
564.944 R(syntax of the From field body might be changed to an address)
7.2 E(or address list rather than a mailbox list, allowing a named)
114.292 576.944 Q
(group with an empty set of mailboxes, but that would not be)114.292
588.944 Q
(compatible with modern deployed implementations which cannot be)114.292
600.944 Q
(expected to cope with such an extension to syntax of the field;)114.292
612.944 Q(such syntax is explicitly prohibited by [N1.STD11] section)
114.292 624.944 Q 7.2(4.4.1. It)114.292 636.944 R
(was, however, legal syntax under an earlier Message)7.2 E
(Format RFC, viz. [I8.RFC733], and is legal in message header)114.292
648.944 Q(recipient address fields and the Reply\255To field.)114.292
660.944 Q
(An alternate syntax change would be to permit an empty angle\255addr)
99.892 684.944 Q(in the mailbox specification.)99.892 696.944 Q
(That too is currently incompatible)14.4 E
(with specified syntax and might not be handled well by some)99.892
708.944 Q(deployed implementations.)99.892 720.944 Q
(Like the above, such syntax was at one)14.4 E
(time legal, and is presently permitted in some address fields)99.892
732.944 Q(\(e.g. Return\255Path\).)99.892 744.944 Q 122.4(Lilly Expires)
56.692 768.944 R(September 15, 2005)7.2 E([Page 3])108 E 0 Cg EP
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/F0 12/Courier@0 SF 64.8(Internet\255Draft From)20.182 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E
(Syntax changes to RFC 822 would affect all protocols using the)63.382
108.944 Q(RFC 822 From field syntax, notably [I9.HTTP].)63.382 120.944 Q
(As noted above, such a syntax change would raise issues with)63.382
144.944 Q(respect to SMTP gateway requirements.)63.382 156.944 Q 7.2(An)
63.382 180.944 S
(ull mailbox or empty mailbox list \(in a named group address\))-7.2 E
(does avoid issues related to DNS \(availability of service,)63.382
192.944 Q(nameserver load, resolver issues\), domain or domain literal)
63.382 204.944 Q(interpretation, and local\255part issues.)63.382
216.944 Q 14.4(f. It)41.782 240.944 R
(is believed that the approach chosen in this memo, viz. to)7.2 E
(make the From field OPTIONAL, has the least adverse impact on)77.782
252.944 Q(the Internet of the available solutions to the problem.)77.782
264.944 Q(It is)14.4 E
(perhaps worth noting that the From field is optional in)77.782 276.944
Q([I9.HTTP].)77.782 288.944 Q 20.182 312.944 EBEGIN
[/Title (2. Requirement Levels) /Dest (S2.) /OUT pdfmark
EEND 20.182 312.944 EBEGIN
[/Dest (S2.) /Page 4 /View [ /FitH 516 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(2. Requirement Levels)20.182 312.944 Q
(The key words "REQUIRED", "SHOULD", "MAY" and "OPTIONAL" in this)41.782
336.944 Q(document are to be interpreted as described in [N3.BCP14].)
41.782 348.944 Q 20.182 372.944 EBEGIN
[/Title (3. Scope) /Dest (S3.) /OUT pdfmark
EEND 20.182 372.944 EBEGIN
[/Dest (S3.) /Page 4 /View [ /FitH 456 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(3. Scope)20.182 372.944 Q
(This memo \(if approved\) updates the Internet Message Format)41.782
396.944 Q(specification [N1.STD11], [N2.RFC2822] as used by various)
41.782 408.944 Q
(applications \(electronic mail [I10.STD10], [I1.RFC2821], Usenet news)
41.782 420.944 Q
([I11.RFC1036], Internet fax [I12.RFC2305], VPIM [I13.RFC3801], EDI)
41.782 432.944 Q([I14.RFC1767], [I15.RFC1865], etc.\).)41.782 444.944 Q
(It applies across the board to)14.4 E
(applications using the Internet Message Format.)41.782 456.944 Q
(However it does not)14.4 E
(discuss similarly named fields in unrelated formats and protocols)
41.782 468.944 Q
(such as [I9.HTTP] or [I16.SIP] \(HTTP uses the RFC 822 field syntax;)
41.782 480.944 Q(SIP does not\).)41.782 492.944 Q(This memo \(if approv\
ed\) relaxes a requirement of the Internet Message)41.782 516.944 Q 7.2
(Format. It)41.782 528.944 R
(does not preclude specific applications from separately)7.2 E
(requiring a From field, but authors of such specifications SHOULD)
41.782 540.944 Q
(consider the situations discussed in this memo which have lead to the)
41.782 552.944 Q(relaxation of the Internet Message Format requirement.)
41.782 564.944 Q 20.182 588.944 EBEGIN
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EEND/F0 12/Courier@0 SF(4. Amendment of STD 11 \(RFC 822\))20.182
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EEND/F0 12/Courier@0 SF(4.1. RFC 822 section 4.1 SYNTAX)20.182 612.944 Q
14.4(authentic =)77.782 636.944 R 43.2(["From" ":")14.4 F
(mailbox] ; Single author)21.6 E 7.2(/\(")164.182 648.944 S 28.8
(Sender" ":")-7.2 F 7.2(mailbox ;)21.6 F(Actual submittor)7.2 E 43.2
(["From" ":")178.582 660.944 R(1#mailbox]\) ; Multiple authors)7.2 E
14.4(;o)394.582 672.944 S 7.2(rn)-14.4 G(ot sender)-7.2 E
(resent\255authentic =)77.782 696.944 Q 36(["Resent\255From" ":")14.4 F
(mailbox])14.4 E 7.2(/\(")207.382 708.944 S 21.6(Resent\255Sender" ":")
-7.2 F(mailbox)21.6 E 36(["Resent\255From" ":")221.782 720.944 R
(1#mailbox] \))7.2 E
(The change is that From and Resent\255From fields are made optional.)
41.782 744.944 Q 122.4(Lilly Expires)20.182 768.944 R
(September 15, 2005)7.2 E([Page 4])108 E 0 Cg EP
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%%BeginPageSetup
BP
%%EndPageSetup
/F0 12/Courier@0 SF 64.8(Internet\255Draft From)56.692 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E 56.692 108.944 EBEGIN
[/Title (4.2. RFC 822 section 4.4.2 SENDER / RESENTSENDER) /Dest (S4.2.) /OUT pdfmark
EEND 56.692 108.944 EBEGIN
[/Dest (S4.2.) /Page 5 /View [ /FitH 720 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF
(4.2. RFC 822 section 4.4.2 SENDER / RESENT\255SENDER)56.692 108.944 Q
(If the From field is omitted, a Sender field MAY be supplied, but it)
78.292 132.944 Q(is not REQUIRED.)78.292 144.944 Q 56.692 168.944 EBEGIN
[/Title (4.3. RFC 822 section 4.4.4. AUTOMATIC USE OF FROM / SENDER / REPLYTO) /Dest (S4.3.) /OUT pdfmark
EEND 56.692 168.944 EBEGIN
[/Dest (S4.3.) /Page 5 /View [ /FitH 660 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(4.3. RFC 822 section 4.4.4. AUTOMATIC USE OF FR\
OM / SENDER / REPLY\255TO)56.692 168.944 Q
(Clearly in the cases under consideration in this memo \(author)78.292
192.944 Q
(anonymity or lack of mailbox\), it is not possible to use a From field)
78.292 204.944 Q(if no such field is present.)78.292 216.944 Q
(That is expected in the circumstances;)14.4 E
(one cannot reply to an anonymous author, nor send Internet email to)
78.292 228.944 Q(an author with no Internet mailbox.)78.292 240.944 Q
56.692 264.944 EBEGIN
[/Title (4.4. RFC 822 section A.2.6. Agent for user without online mailbox) /Dest (S4.4.) /OUT pdfmark
EEND 56.692 264.944 EBEGIN
[/Dest (S4.4.) /Page 5 /View [ /FitH 564 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF
(4.4. RFC 822 section A.2.6. Agent for user without online mailbox)
56.692 264.944 Q 7.2(Af)164.692 288.944 S 7.2
(riend of George's, Sarah, is visiting.)-7.2 F(George's)21.6 E 7.2
(secretary sends some mail)128.692 300.944 R
(to a friend of Sarah in computer\255)7.2 E 7.2(land. Replies)128.692
312.944 R(should go to George, whose mailbox is Jones)7.2 E(at)14.4 E
(Registry.)128.692 324.944 Q(Comments: Sent on behalf of Sarah Friendly)
157.492 348.944 Q 14.4(Sender: Secy\255Name)157.492 360.944 R
(<Secy@Registry>)7.2 E(Reply\255To: Jones@Registry.)157.492 372.944 Q
(The From field is removed, and a Comments field is added to indicate)
78.292 396.944 Q(the initiator of the communications.)78.292 408.944 Q
56.692 432.944 EBEGIN
[/Title (5. Amendment of RFC 2822) /Dest (S5.1.) /OUT pdfmark
EEND 56.692 432.944 EBEGIN
[/Dest (S5.1.) /Page 5 /View [ /FitH 396 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(5. Amendment of RFC 2822)56.692 432.944 Q 56.692
456.944 EBEGIN
[/Title (5.1. RFC 2822 section 3.6. Field definitions) /Dest (S5.1.) /OUT pdfmark
EEND 56.692 456.944 EBEGIN
[/Dest (S5.1.) /Page 5 /View [ /FitH 372 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(5.1. RFC 2822 section 3.6. Field definitions)
56.692 456.944 Q 79.2(from 0*)78.292 480.944 R 108(1S)100.8 G
(ee sender and 3.6.2)-108 E
(The minimum number of From fields is decreased to zero.)78.292 504.944
Q 56.692 528.944 EBEGIN
[/Title (5.2. RFC 2822 section 3.6.2. Originator fields) /Dest (S5.2.) /OUT pdfmark
EEND 56.692 528.944 EBEGIN
[/Dest (S5.2.) /Page 5 /View [ /FitH 300 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(5.2. RFC 2822 section 3.6.2. Originator fields)
56.692 528.944 Q(In the absence of the "Reply-To:" field,)243.892
552.944 Q(replies SHOULD by default be sent to the mailbox\(es\) specif\
ied in the)78.292 564.944 Q
("From:" field, if present, unless otherwise specified by the person)
78.292 576.944 Q(composing the reply.)78.292 588.944 Q 7.2(AF)78.292
612.944 S(rom field cannot be used if not present.)-7.2 E 56.692 636.944
EBEGIN
[/Title (5.3. RFC 2822 section 3.6.6. Resent fields) /Dest (S5.3.) /OUT pdfmark
EEND 56.692 636.944 EBEGIN
[/Dest (S5.3.) /Page 5 /View [ /FitH 192 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(5.3. RFC 2822 section 3.6.6. Resent fields)
56.692 636.944 Q(The requirement for a Resent\255From field is waived i\
f the resender has)78.292 660.944 Q
(no Internet mailbox or if the resender requires anonymity.)78.292
672.944 Q 56.692 696.944 EBEGIN
[/Title (6. Impact Analysis) /Dest (S6.) /OUT pdfmark
EEND 56.692 696.944 EBEGIN
[/Dest (S6.) /Page 5 /View [ /FitH 132 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(6. Impact Analysis)56.692 696.944 Q
(The MIME media type message/rfc822 [I17.RFC2046], section 5.2.1,)78.292
720.944 Q(requires one of From, Subject, or Date fields.)78.292 732.944
Q(In the event that)14.4 E
(there is no From field due to anonymity or lack of an Internet)78.292
744.944 Q 122.4(Lilly Expires)56.692 768.944 R(September 15, 2005)7.2 E
([Page 5])108 E 0 Cg EP
%%Page: 6 6
%%BeginPageSetup
BP
%%EndPageSetup
/F0 12/Courier@0 SF 64.8(Internet\255Draft From)20.182 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E
(mailbox, one of Subject or Date fields would have to be present in)
41.782 108.944 Q(order to comply with the [I17.RFC2046] requirements.)
41.782 120.944 Q
(Message transport protocols [I10.STD10], [I1.RFC2821], [I18.STD53],)
41.782 144.944 Q
([I19.RFC3501], [I20.RFC977], etc. do not make use of the From field,)
41.782 156.944 Q(and so are not affected by this change.)41.782 168.944
Q(Similarly, MDNs \(Message Disposition Notifications\) [I21.RFC3798],)
41.782 192.944 Q
(DSNs \(Disposition Status Notifications\) [I22.RFC3464], and MTSNs)
41.782 204.944 Q
(\(Message Tracking Status Notifications\) [I23.RFC3886] do not use the)
41.782 216.944 Q
(message header From field and are therefore unaffected.)41.782 228.944
Q(Some documents have suggested use of the reserved ".invalid" TLD)
41.782 252.944 Q
(\(top\255level domain name\) [I24.BCP32] to provide some degree of)
41.782 264.944 Q 7.2(anonymity. With)41.782 276.944 R
(relaxation of the requirement for a From field in)7.2 E
(the Internet Message Format, such hacks and their negative impact on)
41.782 288.944 Q
(the root name service are unnecessary, at least within the scope of)
41.782 300.944 Q(Internet Messages.)41.782 312.944 Q
(Some message\255processing applications might assume the guaranteed)
41.782 336.944 Q(presence of a From header field.)41.782 348.944 Q
(Robust applications likely make no)14.4 E
(such assumption and are prepared for absence of the field, which can)
41.782 360.944 Q
(occur due to message modification \(including truncation\) in transit,)
41.782 372.944 Q
(due to message generator design or configuration issues, etc.)41.782
384.944 Q
(Developers SHOULD NOT assume the presence of any particular field and)
41.782 396.944 Q(SHOULD carefully test applications for robustness.)
41.782 408.944 Q 20.182 432.944 EBEGIN
[/Title (7. Acknowledgments) /Dest (S7.) /OUT pdfmark
EEND 20.182 432.944 EBEGIN
[/Dest (S7.) /Page 6 /View [ /FitH 396 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(7. Acknowledgments)20.182 432.944 Q
(The author gratefully acknowledges the helpful comments provided by)
41.782 456.944 Q(members of the ietf\255822 mailing list.)41.782 468.944
Q(In particular, Keith Moore and)14.4 E
(Ned Freed have made detailed and useful comments.)41.782 480.944 Q
20.182 504.944 EBEGIN
[/Title (8. Security Considerations) /Dest (S8.) /OUT pdfmark
EEND 20.182 504.944 EBEGIN
[/Dest (S8.) /Page 6 /View [ /FitH 324 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(8. Security Considerations)20.182 504.944 Q
(No new security considerations are addressed by this memo.)41.782
528.944 Q(This memo)14.4 E
(relaxes requirements on the Internet Message Format specification)
41.782 540.944 Q
(which have resulted in security problems \(specifically due to lack of)
41.782 552.944 Q 7.2(anonymity\). As)41.782 564.944 R
(such, it improves security for message authors who)7.2 E
(require anonymity.)41.782 576.944 Q
(While this memo does not affect transport protocols, being limited in)
41.782 600.944 Q
(scope to the Internet Message Format, users of that format should be)
41.782 612.944 Q
(aware that transport protocols may provide a trail leading to the)
41.782 624.944 Q
(message sender \(who might or might not be distinct from the author\).)
41.782 636.944 Q
(Some protocols, notably [I25.RFC2476] might use authentication)41.782
648.944 Q(information to generate missing message header fields.)41.782
660.944 Q(Some SMTP)14.4 E
([I1.RFC2821] message transfer agent \(MTA\) implementations are known)
41.782 672.944 Q
(to alter message content, including addition of message header)41.782
684.944 Q
(originator fields, even though that practice is not legal except for)
41.782 696.944 Q(the specific case of gateways.)41.782 708.944 Q
(Accordingly, authors should not rely)14.4 E
(on omission of a From header field to provide anonymity without)41.782
720.944 Q(careful evaluation and testing of transport protocols.)41.782
732.944 Q 122.4(Lilly Expires)20.182 768.944 R(September 15, 2005)7.2 E
([Page 6])108 E 0 Cg EP
%%Page: 7 7
%%BeginPageSetup
BP
%%EndPageSetup
/F0 12/Courier@0 SF 64.8(Internet\255Draft From)56.692 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E
([E]SMTP transport, [I1.RFC2821] [I25.RFC2476], carry in the SMTP)78.292
108.944 Q
("envelope" a return path intended for notifications of delivery)78.292
120.944 Q 7.2(problems. Placing)78.292 132.944 R
(an author's \(as opposed to the sender's\) mailbox)7.2 E
(in the SMTP envelope would defeat anonymity.)78.292 144.944 Q
(Some user agents \(UAs\) might be configured to provide an indication)
78.292 168.944 Q
(of the sender \(as sometimes distinct from author\) encoded in host)
78.292 180.944 Q
(names \(as supplied in EHLO or HELO SMTP commands and recorded in)
78.292 192.944 Q(trace fields\) and/or message identifiers.)78.292
204.944 Q(In the case that the)14.4 E
(author and sender are identical, such configurations make anonymity)
78.292 216.944 Q 7.2(impractical. Note)78.292 228.944 R
(that in general it is possible to trace the)7.2 E
(sender, so anonymity is only practical where the sender is not the)
78.292 240.944 Q(message author \(or one of the authors\).)78.292
252.944 Q(Arrangements for such true)14.4 E
(anonymity -- where even the sender is unaware of the identity of the)
78.292 264.944 Q
(author\(s\) -- \(e.g.. some sort of drop box\) are beyond the scope of)
78.292 276.944 Q(this memo.)78.292 288.944 Q(Developers and administrat\
ors of message submission agents \(MSAs\) and)78.292 312.944 Q
(MTAs SHOULD carefully consider implications of breaching anonymity)
78.292 324.944 Q
(and/or mistakenly associating an Internet mailbox with an author \(as)
78.292 336.944 Q
(distinct from sender\) who has no such mailbox, and SHOULD design and)
78.292 348.944 Q
(operate software with due consideration for those circumstances.)78.292
360.944 Q(Administrators SHOULD advise users and potential users of any)
78.292 372.944 Q
(anonymity\255breaching configurations of MSAs or administered UAs.)
78.292 384.944 Q 56.692 408.944 EBEGIN
[/Title (9. Internationalization Considerations) /Dest (S9.) /OUT pdfmark
EEND 56.692 408.944 EBEGIN
[/Dest (S9.) /Page 7 /View [ /FitH 420 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(9. Internationalization Considerations)56.692
408.944 Q(This memo raises no new internationalization considerations.)
78.292 432.944 Q 56.692 456.944 EBEGIN
[/Title (10. IANA Considerations) /Dest (S10.) /OUT pdfmark
EEND 56.692 456.944 EBEGIN
[/Dest (S10.) /Page 7 /View [ /FitH 372 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(10. IANA Considerations)56.692 456.944 Q
(IANA shall update the From header field registration to include this)
78.292 480.944 Q
(document's RFC number in the list of Specification Documents upon)
78.292 492.944 Q(approval by the IESG.)78.292 504.944 Q
(At the same time, it would be helpful if IANA)14.4 E
(were to provide useful and meaningful titles for the message header)
78.292 516.944 Q
(field name registry lists, which currently are identified by the)78.292
528.944 Q
(nonsensical phrases "header messages" and "message header messages".)
78.292 540.944 Q 56.692 576.944 EBEGIN
[/Title (Appendix A. Change History) /Dest (SA.) /OUT pdfmark
EEND 56.692 576.944 EBEGIN
[/Dest (SA.) /Page 7 /View [ /FitH 252 ] /DEST pdfmark
EEND/F0 12/Courier@0 SF(Appendix A. Change History)56.692 576.944 Q
([[This change history will not be part of a published RFC]])78.292
600.944 Q(-01 to -02)78.292 624.944 Q 16.8<8361>99.892 648.944 S
(dded this change history)-16.8 E 16.8<8361>99.892 672.944 S
(dded discussion of syntax change alternatives, with)-16.8 E(references)
123.892 684.944 Q 16.8<8361>99.892 708.944 S
(dded discussion of domain literal alternative, with)-16.8 E(references)
123.892 720.944 Q 16.8<8361>99.892 744.944 S
(dded discussion of assumptions about header field presence)-16.8 E
122.4(Lilly Expires)56.692 768.944 R(September 15, 2005)7.2 E([Page 7])
108 E 0 Cg EP
%%Page: 8 8
%%BeginPageSetup
BP
%%EndPageSetup
/F0 12/Courier@0 SF 64.8(Internet\255Draft From)20.182 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E 16.8<8365>63.382 108.944 S
(xpanded discussion of security considerations, with)-16.8 E(references)
87.382 120.944 Q 16.8<8375>63.382 144.944 S(pdated acknowledgments)-16.8
E 16.8<8372>63.382 168.944 S(evised boilerplate)-16.8 E(-00 to -01)
41.782 192.944 Q 16.8<8363>63.382 216.944 S
(onverted prose discussion of alternative approaches to)-16.8 E
(numbered list)87.382 228.944 Q 16.8<8366>63.382 252.944 S
(ixed RFC 822 revised ABNF line formatting \(line break\))-16.8 E
(Normative References)20.182 276.944 Q([N1.STD11])41.782 300.944 Q
135.382 300.944 EBEGIN
[/Dest (N1) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Crocker, D., "Standard for the format of ARPA Internet)135.382 300.944
Q(text messages", STD 11, RFC 822, August 1982.)135.382 312.944 Q
([N2.RFC2822])41.782 336.944 Q 135.382 336.944 EBEGIN
[/Dest (N2) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Resnick, P., "Internet Message Format", RFC 2822, April)135.382 336.944
Q(2001.)135.382 348.944 Q([N3.BCP14])41.782 372.944 Q 135.382 372.944
EBEGIN
[/Dest (N3) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Bradner, S., "Key words for use in RFCs to Indicate)135.382 372.944 Q
(Requirement Levels", BCP 14, RFC 2119, March 1997.)135.382 384.944 Q
(Informative References)20.182 408.944 Q([I1.RFC2821])41.782 432.944 Q
156.982 432.944 EBEGIN
[/Dest (I1) /DEST pdfmark
EEND/F0 12/Courier@0 SF(Klensin, J., "Simple Mail Transfer Protocol",)
156.982 432.944 Q(RFC 2821, April 2001.)156.982 444.944 Q
([I2.SiteFinder])41.782 468.944 Q 156.982 468.944 EBEGIN
[/Dest (I2) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(SSAC Report: Redirection in the Com and Net Domains,)156.982 468.944 Q
7.2(AR)156.982 480.944 S(eport From the ICANN Security and Stability)
-7.2 E(Advisory Committee \(SSAC\), 9 July 2004)156.982 492.944 Q
([I3.RFC3330])41.782 516.944 Q 156.982 516.944 EBEGIN
[/Dest (I3) /DEST pdfmark
EEND/F0 12/Courier@0 SF(IANA, "Special-Use IPv4 Addresses", RFC 3330,)
156.982 516.944 Q(September 2002.)156.982 528.944 Q([I4.RFC3849])41.782
552.944 Q 156.982 552.944 EBEGIN
[/Dest (I4) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Huston, G., Lord, A., and P. Smith, "IPv6 Address)156.982 552.944 Q
(Prefix Reserved for Documentation", RFC 3849, July)156.982 564.944 Q
(2004.)156.982 576.944 Q([I5.RFC3701])41.782 600.944 Q 156.982 600.944
EBEGIN
[/Dest (I5) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Fink, R. and R. Hinden, "6bone \(IPv6 Testing Address)156.982 600.944 Q
(Allocation\) Phaseout", RFC 3701, March 2004.)156.982 612.944 Q
([I6.RFC3513])41.782 636.944 Q 156.982 636.944 EBEGIN
[/Dest (I6) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Hinden, R. and S. Deering, "Internet Protocol Version)156.982 636.944 Q
7.2(6\()156.982 648.944 S
(IPv6\) Addressing Architecture", RFC 3513, April)-7.2 E(2003.)156.982
660.944 Q([I7.STD3])41.782 684.944 Q 156.982 684.944 EBEGIN
[/Dest (I7) /DEST pdfmark
EEND/F0 12/Courier@0 SF(Braden, R., "Requirements for Internet Hosts -)
156.982 684.944 Q(Application and Support", STD 3, RFC 1123, October)
156.982 696.944 Q(1989.)156.982 708.944 Q 122.4(Lilly Expires)20.182
768.944 R(September 15, 2005)7.2 E([Page 8])108 E 0 Cg EP
%%Page: 9 9
%%BeginPageSetup
BP
%%EndPageSetup
/F0 12/Courier@0 SF 64.8(Internet\255Draft From)56.692 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E([I8.RFC733])78.292 108.944
Q 193.492 108.944 EBEGIN
[/Dest (I8) /DEST pdfmark
EEND/F0 12/Courier@0 SF(Crocker, D., Pogran, K., Vittal, J., and D.)
193.492 108.944 Q(Henderson, "Proposed official standard for the format)
193.492 120.944 Q(of ARPA Network messages", RFC 724, May 1977.)193.492
132.944 Q([I9.HTTP])78.292 156.944 Q 193.492 156.944 EBEGIN
[/Dest (I9) /DEST pdfmark
EEND/F0 12/Courier@0 SF(Berners-Lee, T., Fielding, R., and H. Frystyk,)
193.492 156.944 Q
("Hypertext Transfer Protocol \255\255 HTTP/1.0", RFC 1945,)193.492
168.944 Q(May 1996.)193.492 180.944 Q([I10.STD10])78.292 204.944 Q
193.492 204.944 EBEGIN
[/Dest (I10) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Postel, J., "Simple Mail Transfer Protocol", STD 10,)193.492 204.944 Q
(RFC 821, August 1982.)193.492 216.944 Q([I11.RFC1036])78.292 240.944 Q
193.492 240.944 EBEGIN
[/Dest (I11) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Horton, M. and R. Adams, "Standard for interchange of)193.492 240.944 Q
(USENET messages", RFC 1036, December 1987.)193.492 252.944 Q
([I12.RFC2305])78.292 276.944 Q 193.492 276.944 EBEGIN
[/Dest (I12) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Toyoda, K., Ohno, H., Murai, J., and D. Wing, "A)193.492 276.944 Q
(Simple Mode of Facsimile Using Internet Mail",)193.492 288.944 Q
(RFC 2305, March 1998.)193.492 300.944 Q([I13.RFC3801])78.292 324.944 Q
193.492 324.944 EBEGIN
[/Dest (I13) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Vaudreuil, G. and G. Parsons, "Voice Profile for)193.492 324.944 Q
(Internet Mail \255 version 2 \(VPIMv2\)", RFC 3801, June)193.492
336.944 Q(2004.)193.492 348.944 Q([I14.RFC1767])78.292 372.944 Q 193.492
372.944 EBEGIN
[/Dest (I14) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Crocker, D., "MIME Encapsulation of EDI Objects",)193.492 372.944 Q
(RFC 1767, March 1995.)193.492 384.944 Q([I15.RFC1865])78.292 408.944 Q
193.492 408.944 EBEGIN
[/Dest (I15) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Houser, W., Griffin, J., and C. Hage, "EDI Meets the)193.492 408.944 Q
(Internet Frequently Asked Questions about Electronic)193.492 420.944 Q
(Data Interchange \(EDI\) on the Internet", RFC 1865,)193.492 432.944 Q
(January 1996.)193.492 444.944 Q([I16.SIP])78.292 468.944 Q 193.492
468.944 EBEGIN
[/Dest (I16) /DEST pdfmark
EEND/F0 12/Courier@0 SF(Rosenberg, J., Schulzrinne, H., Camarillo, G.,)
193.492 468.944 Q(Johnston, A., Peterson, J., Sparks, R., Handley, M.,)
193.492 480.944 Q(and E. Schooler, "SIP: Session Initiation Protocol",)
193.492 492.944 Q(RFC 3261, June 2002.)193.492 504.944 Q([I17.RFC2046])
78.292 528.944 Q 193.492 528.944 EBEGIN
[/Dest (I17) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Freed, N. and N. Borenstein, "Multipurpose Internet)193.492 528.944 Q
(Mail Extensions \(MIME\) Part Two: Media Types",)193.492 540.944 Q
(RFC 2046, November 1996.)193.492 552.944 Q([I18.STD53])78.292 576.944 Q
193.492 576.944 EBEGIN
[/Dest (I18) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Myers, J. and M. Rose, "Post Office Protocol \255)193.492 576.944 Q
(Version 3", STD 53, RFC 1939, May 1996.)193.492 588.944 Q
([I19.RFC3501])78.292 612.944 Q 193.492 612.944 EBEGIN
[/Dest (I19) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL \255)193.492 612.944 Q
(VERSION 4rev1", RFC 3501, March 2003.)193.492 624.944 Q([I20.RFC977])
78.292 648.944 Q 193.492 648.944 EBEGIN
[/Dest (I20) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Kantor, B. and P. Lapsley, "Network News Transfer)193.492 648.944 Q
(Protocol", RFC 977, February 1986.)193.492 660.944 Q([I21.RFC3798])
78.292 684.944 Q 193.492 684.944 EBEGIN
[/Dest (I21) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Hansen, T. and G. Vaudreuil, "Message Disposition)193.492 684.944 Q
(Notification", RFC 3798, May 2004.)193.492 696.944 Q([I22.RFC3464])
78.292 720.944 Q 193.492 720.944 EBEGIN
[/Dest (I22) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Moore, K. and G. Vaudreuil, "An Extensible Message)193.492 720.944 Q
(Format for Delivery Status Notifications", RFC 3464,)193.492 732.944 Q
(January 2003.)193.492 744.944 Q 122.4(Lilly Expires)56.692 768.944 R
(September 15, 2005)7.2 E([Page 9])108 E 0 Cg EP
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/F0 12/Courier@0 SF 64.8(Internet\255Draft From)20.182 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E([I23.RFC3886])41.782
108.944 Q 156.982 108.944 EBEGIN
[/Dest (I23) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Allman, E., "An Extensible Message Format for Message)156.982 108.944 Q
(Tracking Responses", RFC 3886, September 2004.)156.982 120.944 Q
([I24.BCP32])41.782 144.944 Q 156.982 144.944 EBEGIN
[/Dest (I24) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Eastlake 3rd, D. and A. Panitz, "Reserved Top Level)156.982 144.944 Q
(DNS Names", BCP 32, RFC 2606, June 1999.)156.982 156.944 Q
([I25.RFC2476])41.782 180.944 Q 156.982 180.944 EBEGIN
[/Dest (I25) /DEST pdfmark
EEND/F0 12/Courier@0 SF
(Gellens, R. and J. Klensin, "Message Submission",)156.982 180.944 Q
(RFC 2476, December 1998.)156.982 192.944 Q(Author's Address)20.182
216.944 Q(Bruce Lilly)41.782 240.944 Q(Email: blilly@erols.com)41.782
264.944 Q(Full Copyright Statement)20.182 288.944 Q 7.2
(Copyright \251 The)41.782 312.944 R(Internet Society \(2005\).)7.2 E
(This document is subject to the rights, licenses and restrictions)
41.782 336.944 Q
(contained in BCP 78, and except as set forth therein, the author)41.782
348.944 Q(retains all his rights.)41.782 360.944 Q
(This document and the information contained herein are provided on an)
41.782 384.944 Q
("AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE REPRESENTS OR)
41.782 396.944 Q
(IS SPONSORED BY \(IF ANY\), THE INTERNET SOCIETY AND THE INTERNET)
41.782 408.944 Q
(ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,)
41.782 420.944 Q
(INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE)41.782
432.944 Q
(INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED)41.782
444.944 Q
(WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.)
41.782 456.944 Q(Intellectual Property Statement)20.182 480.944 Q
(The IETF takes no position regarding the validity or scope of any)
41.782 504.944 Q
(Intellectual Property Rights or other rights that might be claimed to)
41.782 516.944 Q
(pertain to the implementation or use of the technology described in)
41.782 528.944 Q
(this document or the extent to which any license under such rights)
41.782 540.944 Q
(might or might not be available; nor does it represent that it has)
41.782 552.944 Q
(made any independent effort to identify any such rights.)41.782 564.944
Q(Information)14.4 E
(on the procedures with respect to rights in RFC documents can be)41.782
576.944 Q(found in BCP 78 and BCP 79.)41.782 588.944 Q
(Copies of IPR disclosures made to the IETF Secretariat and any)41.782
612.944 Q
(assurances of licenses to be made available, or the result of an)41.782
624.944 Q
(attempt made to obtain a general license or permission for the use of)
41.782 636.944 Q
(such proprietary rights by implementers or users of this)41.782 648.944
Q(specification can be obtained from the IETF on\255line IPR repository\
 at)41.782 660.944 Q(http://www.ietf.org/ipr.)41.782 672.944 Q
(The IETF invites any interested party to bring to its attention any)
41.782 696.944 Q
(copyrights, patents or patent applications, or other proprietary)41.782
708.944 Q
(rights that may cover technology that may be required to implement)
41.782 720.944 Q(this standard.)41.782 732.944 Q
(Please address the information to the IETF at)14.4 E
(ietf\255ipr@ietf.org.)41.782 744.944 Q 122.4(Lilly Expires)20.182
768.944 R(September 15, 2005)7.2 E([Page 10])100.8 E 0 Cg EP
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/F0 12/Courier@0 SF 64.8(Internet\255Draft From)56.692 84.944 R
(Field Made Optional)7.2 E(March 2005)100.8 E(Acknowledgment)56.692
108.944 Q
(Funding for the RFC Editor function is currently provided by the)78.292
132.944 Q(Internet Society.)78.292 144.944 Q 122.4(Lilly Expires)56.692
768.944 R(September 15, 2005)7.2 E([Page 11])100.8 E 0 Cg EP

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