Description

The Extended Simple Mail Transfer Protocol (ESMTP) is an Internet standard for electronic mail transmission across the Internet. It is an extension of the original Simple Mail Transfer Protocol (SMTP) and is used to transmit messages between mail servers. It enables users to send and receive emails over the Internet using a set of commands that are compatible with the SMTP protocol. ESMTP also provides features such as authentication and TLS/SSL encryption for secure communication. It is one of the most widely used protocols for sending and receiving emails and is the foundation of the email system.

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