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En correo electrónico[2] que sirve como marcador distintivo de la cuenta de correo electrónico de una persona, sigue un formato específico: parte local@dominio. La parte local, que no excede de 64 octetos, denota el buzón específico, y el dominio, limitado a 255 octetos, señala el servidor de correo. Estas direcciones de correo electrónico son indispensables para la correspondencia a través de PC, dispositivos móviles o plataformas de webmail, y a menudo sirven como verificación de usuario en sitios web. Sin embargo, el formato correcto no confirma necesariamente la existencia. Para validar la existencia de buzones de correo se utilizan métodos como la verificación por retrollamada. Los correos electrónicos se retransmiten a través del Internet[3] utilizando el protocolo SMTP tal y como se define en RFC5321 y 5322, con el cliente SMTP empleando el protocolo nombre de dominio[1] para localizar la dirección IP de intercambio de correo. Además, el IETF ha avanzado en la internacionalización de las direcciones de correo electrónico, permitiendo caracteres no ASCII. El dominio de la dirección de correo electrónico debe cumplir normas estrictas, como un límite de 63 caracteres y la incorporación de letras, dígitos y guiones.
En dirección de correo electrónico identifica un correo electrónico buzón al que se envían los mensajes. Aunque los primeros sistemas de mensajería utilizaban diversos formatos para las direcciones, en la actualidad las direcciones de correo electrónico siguen un conjunto de normas específicas estandarizadas originalmente por la Grupo operativo de ingeniería de Internet (IETF) en la década de 1980, y actualizado porRFC 5322 y 6854. El término dirección de correo electrónico en este artículo se refiere sólo a la addr-spec en la sección 3.4 de la RFC 5322. La RFC define dirección más ampliamente como buzón o grupo. A buzón puede ser nombre-addrque contiene un nombre para mostrar y addr-speco el más común addr-spec solo.
Una dirección de correo electrónico, como john.smith@example.comse compone de un parte localel símbolo @ y una dominioque puede ser un nombre de dominio o un Dirección IP entre corchetes. Aunque la norma exige que la parte local distinga entre mayúsculas y minúsculas, también insta a que los hosts receptores entreguen los mensajes de forma independiente de mayúsculas y minúsculas, por ejemplo, que el sistema de correo del dominio ejemplo.com tratar John Smith como equivalente a john.smithalgunos sistemas de correo incluso los tratan como equivalentes a johnsmith. Los sistemas de correo suelen limitar la elección del nombre de los usuarios a un subconjunto de los caracteres técnicamente permitidos.
Con la introducción de nombres de dominio internacionalizadosSe están haciendo esfuerzos para permitir que los noASCII caracteres en las direcciones de correo electrónico.