SMTP (Simple Mail Transfer Protocol) is a protocol for transmitting email messages between servers. It is the primary protocol used to send and receive email on the internet.
When an email is sent, it is first transmitted to the sender’s mail server using SMTP. The server then looks up the destination email address and forwards the message to the recipient’s mail server using SMTP. The recipient’s mail server then delivers the message to the recipient’s email client.
SMTP is a simple, text-based protocol that uses a series of commands and responses to transmit email messages between servers. It is an essential part of the internet’s infrastructure and is used by billions of people around the world to send and receive email.