Which Protocol is used for sending and receiving mails ?

SMTP(Simple Mail Transfer Protocol) is Used for sending and receiving mails.

simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks. SMTP was first defined by RFC 821 (1982, eventually declared STD 10), and last updated by RFC 5321 (2008) which includes the Extended SMTP (ESMTP) additions, and is the protocol in widespread use today.

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