Simple Mail Transport Protocol (SMTP) is a protocol used in sending and
receiving e-mail. However, since it is limited in its ability to queue
messages at the receiving end, it is usually used with one of two other
protocols, POP3 or IMAP, which let the user save messages in a server
mailbox and download them periodically from the server. In other words,
users typically use a program that uses SMTP for sending e-mail and
either POP3 or IMAP for receiving e-mail.
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