Le 27/06/2014 20:34, The Wanderer a écrit : > > Every E-mail or newsgroup post made by a standards-compliant mail > program contains a theoretically-unique ID number, called the Message-ID > header. > > When you hit Reply on an E-mail using a modern mail client (and quite a > few non-modern ones), in addition to generating a new Message-ID for > your reply, the mail client creates another header called "In-Reply-To". > It copies the Message-ID from the original mail into this new header. > > Then, when someone receives both the original mail and your reply, their > own mail client can use these two headers to figure out that "these two > mails belong together, in this order". > > Some mail clients (such as Thunderbird) can use that information to > display a nested hierarchy of "which mail is a reply to which", which I > find very useful; others just use it for "conversation view"-type > sorting; others ignore it entirely. If someone using a mail client which > is configured to not ignore that information receives both messages, > they will immediately be able to tell that your message is a reply, even > if you changed the Subject line. > > The essential takeaway from this is that if you want to create a new > thread on a mailing list or similar public forum, it's not good enough > to just hit Reply on an existing mail and change the Subject line; you > need to create a New mail instead, and enter the To address separately. > And note that with Icedove (that Diogene uses) you can right click on the address in the header of an existing post and choose "send a message to this address", or equivalent (I have a french version). Which will really create a new email.
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