2006-08-24 19:49:11 · 4 answers · asked by tamzo 1 in Computers & Internet ➔ Internet
Simple Mail Transfer Protocol (SMTP) is the de facto standard for e-mail transmissions across the Internet. Formally SMTP is defined in RFC 821 (STD 10) as amended by RFC 1123 (STD 3) chapter 5. The protocol used today is also known as ESMTP and defined in RFC 2821.
SMTP is a relatively simple, text-based protocol, where one or more recipients of a message are specified (and in most cases verified to exist) and then the message text is transferred. It is quite easy to test an SMTP server using the telnet program.
SMTP uses TCP port 25. To determine the SMTP server for a given domain name, the MX (Mail eXchange) DNS record is used, falling back to a simple A record in the case of no MX.
SMTP started becoming widely used in the early 1980s. At the time, it was a complement to UUCP (Unix to Unix CoPy) which was better suited to handle e-mail transfers between machines that were intermittently connected. SMTP, on the other hand, works best when both the sending and receiving machines are connected to the network all the time.
2006-08-24 19:52:54 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Simple Mail Transfer Protocol (SMTP) is like POP3
pop3 is use only in pc
but smtp can use in mobile-phone
2006-08-24 19:58:14 · answer #2 · answered by Anonymous · 1⤊ 0⤋
SMTP = send mail transfer protocol.
Its what allows you to send mail and relay between hosts.
2006-08-24 19:53:14 · answer #3 · answered by dzr0001 5 · 0⤊ 0⤋
Nice question
2015-04-03 02:47:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋