SMTP
The TCP/IP protocol SMTP (Simple Mail Transfer Protocol) is used to transmit and receive e-mail. Due to its limited capacity to queue messages at the receiving end, it is frequently combined with one of two other protocols, POP3 (Post Office Protocol) or IMAP (Internet Message Access Protocol), which allow the user to save messages in a server mailbox and download them periodically. In other words, users often utilise a programme that sends e-mail over SMTP and receives e-mail via POP3 or IMAP. SMTP can transmit and receive mail, but it is inefficient in queuing incoming messages, which is why it is frequently delegated to other protocols.
