--- id: "message_id" kind: "datatype" status: "stable" is_pii: false categories: ["internet"] langs: ["common"] quality: 90 url: "http://registry.apicrafter.io/datatype/message_id" --- # Message-ID (Email Message Identifier) (`message_id`) Globally unique identifier of an email message, which the sending client or server writes in the Message-ID header (RFC 5322, section 3.6.4). It has the form : the right part is usually the domain name of the host that created it, and the left part is a unique string such as a timestamp with a random suffix. Replies refer to it in their In-Reply-To and References headers. - Personal data (PII): no - Categories: Internet (internet) - Countries: global - Languages: Common to most languages (common) - Classification: identifier ## Detection Regular expression (Python `re`): ``` ^<[^<>@\s]+@[^<>@\s]+>$ ``` ## Examples - `<1234@local.machine.example>` — Example of RFC 5322, appendix A.1.1 - `<5678.21-Nov-1997@example.com>` — Example of RFC 5322, appendix A.1.2 - `` — Example of RFC 5322, appendix A.1.3 - `1234@local.machine.example` (invalid example) — No angle brackets - `<1234@local.machine.example> <3456@example.net>` (invalid example) — Two identifiers, as in a References header ## Metacrafter rules 2 rules: 1 match the field name, 1 match values. - `messageidfield` (field, `common/internet.yaml`) - `messageidvalue` (data, `common/internet.yaml`) ## Supported by tools - `metacrafter` ## Translations - ru: Идентификатор письма (Message-ID): Уникальный идентификатор письма из заголовка Message-ID в форме <левая_часть@правая_часть> (RFC 5322). ## Sources - wikipedia: - doc: ## Quality Score 90/100. Missing: mapping (Wikidata, Schema.org, ...). JSON: · Edit: