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Simple Mail Transfer Protocol (SMTP)

January 29, 2023

Simple Mail Transfer Protocol (SMTP) is used for sending and delivering email messages over the internet. It is a standard protocol used by most email clients, servers, and services to send and receive email messages.

Simple Mail Transfer Protocol (SMTP) is responsible for sending emails from the sender’s client to the recipient’s email server. It establishes a connection between the sender and the recipient’s server, authenticates the sender, and transfers the email message.

SMTP uses a series of commands and replies to perform different actions, such as:

Connecting to the recipient’s server: The sender’s email client establishes a connection with the recipient’s server using the SMTP protocol.

Sending the email message: The sender’s email client sends the email message to the recipient’s server, including the recipient’s email address, the sender’s email address, and the message body.

Delivering the email message: The recipient’s server receives and delivers the email message to the recipient’s email client.

Simple Mail Transfer Protocol (SMTP) is a simple but reliable protocol that has been used for decades. However, it does not provide any security features to protect email messages from being intercepted or modified during transmission, so it is typically used in combination with other protocols, such as Secure SMTP (SMTPS) or StartTLS encrypt the connection and protect email messages.

Also, See: Document Type Definition (DTD)

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