Message-ID

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Message-ID is a unique identifier for a digital message, most commonly a globally unique identifier used in email and Usenet newsgroups.[1]

Message-IDs are required to have a specific format which is a subset of an email address[2] (though Microsoft Outlook is known to generate invalid IDs with three parts[3]) and to be globally unique. That is, no two different messages must ever have the same Message-ID. A common technique used by many message systems is to use a time and date stamp along with the local host's domain name, e.g., 950124.162336@example.com.[4]

A large number of mails to public mailinglists can be found via their Message-ID by using a link of the form http://mid.gmane.org/alpine.BSF.2.00.1004291655110.61392@x.fncre.vasb

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