OT - EMEW (Enhanced Message-ID as Email Watermark) breaks
Hugo van der Kooij
hvdkooij at vanderkooij.org
Mon Aug 25 17:46:48 IST 2008
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Steve Freegard wrote:
> Hugo van der Kooij wrote:
>> It is safe to assume someone has been tampering with my message
>> Identifiers. And I am entitled to block those as RFC violations.
> This is a bug, not a RFC violation; show me where in any of the e-mail
> RFCs it says that a Message-ID cannot be modified.
The second paragraph clearly indicates this particular case:
The "Message-ID:" field provides a unique message identifier that
refers to a particular version of a particular message. The
uniqueness of the message identifier is guaranteed by the host that
generates it (see below). This message identifier is intended to be
machine readable and not necessarily meaningful to humans. A message
identifier pertains to exactly one instantiation of a particular
message; subsequent revisions to the message each receive new message
Note: There are many instances when messages are "changed", but those
changes do not constitute a new instantiation of that message, and
therefore the message would not get a new message identifier. For
example, when messages are introduced into the transport system, they
are often prepended with additional header fields such as trace
fields (described in section 3.6.7) and resent fields (described in
section 3.6.6). The addition of such header fields does not change
the identity of the message and therefore the original "Message-ID:"
field is retained. In all cases, it is the meaning that the sender
of the message wishes to convey (i.e., whether this is the same
message or a different message) that determines whether or not the
"Message-ID:" field changes, not any particular syntactic difference
that appears (or does not appear) in the message.
So the Message-ID is mine when I set it and not of someone else to
mangle with in the way it is now mangled.
hvdkooij at vanderkooij.org http://hugo.vanderkooij.org/
PGP/GPG? Use: http://hugo.vanderkooij.org/0x58F19981.asc
>Q: Are you sure?
>>A: Because it reverses the logical flow of conversation.
>>>Q: Why is top posting frowned upon?
Bored? Click on http://spamornot.org/ and rate those images.
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