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   » » Wiki: Message-id
Tag Wiki 'Message-id'.


Message-ID is a unique identifier for a digital message, most commonly a globally unique identifier used in and .

(2023). 9780121631048, .

Message-IDs are required to have a specific format which is a subset of an and be globally unique. No two different messages must ever have the same Message-ID. If two messages have the same Message-ID, they are assumed to be the same and one version is discarded. This can cause issues if tools mangle the IDs created by other tools. Such a problem has been reported with Google MTAs mangling Message-IDs created by Outlook, making it difficult to reference other messages and breaking threading.

Message-IDs, if present, are generated by the or by the first mail server. A common method of generating such ID is by combining the time and domain name, for example:

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