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Dirección de correo electrónico

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En correo electrónico^[2] address, serving as a distinct marker for an individual’s electronic mail account, adheres to a specific format: local-part@domain. The local-part, not exceeding 64 octets, denotes the specific mailbox, and the domain, limited to 255 octets, points to the mail server. These email addresses are indispensable for correspondence through PCs, mobile devices, or webmail platforms, and frequently serve as user verification on websites. Yet, the correct format doesn’t necessarily confirm existence. Methods like callback verification are utilized to validate the existence of mailboxes. Emails are relayed via the Internet^[3] utilizing the SMTP protocol as defined in RFC5321 and 5322, with the SMTP client employing the domain name^[1] to locate the mail exchange IP address. Moreover, the IETF has made strides to internationalize email addresses, allowing non-ASCII characters. The email address’s domain must comply with stringent rules, including a character limit of 63 and the incorporation of letters, digits, and hyphens.

Definición de términos

1. ↑ domain name. Domain names are textual identifiers that signify internet resources, including computers and services. They symbolize ownership or control of a resource and offer a memorable name for these entities. The structure of a domain name consists of labels concatenated and separated by dots, arranged in a hierarchy from right to left. Each label can hold 1 to 63 octets, and the total domain name should not go beyond 253 ASCII characters. The Domain Name System (DNS) converts these domain names into IP addresses, aiding in the distribution of web traffic among various servers. Organized in a tree structure, domain names have Top-Level Domains (TLDs) like .com, .org, .net at the topmost level. The Internet Corporation for Assigned Names and Numbers (ICANN) manages the allocation of TLDs and accredits domain registrars. Domain names can also be internationalized, with numerous registries adopting the Internationalized domain name (IDNA) system approved by ICANN. The domain name sector is vulnerable to cyber threats such as spoofing, but protective measures are in place.

2. ↑ correo electrónico. El correo electrónico, herramienta vital de comunicación desde su introducción en 1975, se ha convertido en parte integrante de nuestra vida cotidiana. Este sistema funciona a través de redes informáticas e Internet, lo que permite la transmisión y recepción global de mensajes. Aunque "email" es el término comúnmente aceptado en los manuales de estilo, en ocasiones se utilizan variantes como "E-mail", sobre todo en contextos del inglés americano y británico. El proceso de este sistema incluye que un remitente redacte un mensaje a través de un Agente de Usuario de Correo (MUA), que luego lo envía al servidor de intercambio de correo del destinatario. Posteriormente, el MUA del destinatario recupera el mensaje. Gracias a la extensión MIME (Multipurpose Internet Mail Extension), los correos electrónicos pueden incluir contenidos multimedia. Para mayor seguridad, los sistemas de correo electrónico emplean un modelo de almacenamiento y reenvío, según el cual los servidores de correo electrónico reciben, reenvían, almacenan y entregan los mensajes. Este método facilita los intercambios de correo electrónico sin necesidad de que los usuarios estén conectados simultáneamente.

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Dirección de correo electrónico (Wikipedia)

En dirección de correo electrónico identifies an correo electrónico box to which messages are delivered. While early messaging systems used a variety of formats for addressing, today, email addresses follow a set of specific rules originally standardized by the Internet Engineering Task Force (IETF) in the 1980s, and updated byRFC 5322 y 6854. The term email address in this article refers to just the addr-spec in Section 3.4 of RFC 5322. The RFC defines address more broadly as either a mailbox o group. A mailbox value can be either a name-addr, which contains a display-name y addr-spec, or the more common addr-spec alone.

An email address, such as john.smith@example.com, is made up from a local-part, the symbol @, and a domain, which may be a domain name o un IP address enclosed in brackets. Although the standard requires the local-part to be case-sensitive, it also urges that receiving hosts deliver messages in a case-independent manner, e.g., that the mail system in the domain example.com treat John.Smith as equivalent to john.smith; some mail systems even treat them as equivalent to johnsmith. Mail systems often limit the users' choice of name to a subset of the technically permitted characters.

With the introduction of internationalized domain names, efforts are progressing to permit non-ASCII characters in email addresses.

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