Tony Earnshaw --> dkim-milter-discuss (2008-01-21 12:53:35 +0100): > Correct me if I'm wrong anybody, but a Message-ID is supposed to be > unique. See rfc2822 3.6.4. Identification fields: > > The "Message-ID:" field contains a single unique message identifier. > The "References:" and "In-Reply-To:" field each contain one or more > unique message identifiers, optionally separated by CFWS.
That's correct, and two paragraphs later there's the following note: 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. And that's BTW exactly what e.g. mutt does when you bounce / resend a message: it retains the Message-ID and creates a new Resent-Message-ID. > If a client MUA or an MTA sends a message twice, both will have discrete > Message-IDs. Alternatively, either the client software is badly broken No. It's broken if it does change the Message-ID (see above). Regards, Jukka -- bashian roulette: $ ((RANDOM%6)) || rm -rf ~ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ dkim-milter-discuss mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dkim-milter-discuss
