What is Simple Mail Transfer Protocol?

Simple Mail Transfer Protocol (SMTP) is a Application Layer protocol in the Email category. Standard protocol for sending email between mail servers. Handles message routing, delivery, and relay across the internet.

What port does SMTP use?

SMTP uses port 25, 465, 587 by default. The protocol is defined in RFC 5321.

SMTP :25

Simple Mail Transfer Protocol

Application Layer — Email

Resumen del protocolo

Nombre completo Simple Mail Transfer Protocol

Abreviatura SMTP

Capa OSI Application Layer

Categoría Email

Puerto predeterminado 25, 465, 587

RFC RFC 5321

Acerca de SMTP

Standard protocol for sending email between mail servers. Handles message routing, delivery, and relay across the internet.

Application Layer Email Puerto 25, 465, 587

Referencia de estándares

SMTP está definido en RFC 5321, publicado por el Internet Engineering Task Force (IETF). Los RFC son los documentos de estándares oficiales para los protocolos de internet y están disponibles gratuitamente para revisión pública.

Protocolos relacionados — Application Layer

HTTP Hypertext Transfer Protocol HTTPS HTTP Secure HTTP/2 HTTP/2 HTTP/3 HTTP/3 WS WebSocket IMAP Internet Message Access Protocol POP3 Post Office Protocol v3 FTP File Transfer Protocol