What is Simple Mail Transfer Protocol?
{{IPstack}} '''Simple Mail Transfer Protocol''' ('''SMTP''') is an [[Internet]] [[communication protocol]] used to send and relay an [[E-mail|email]] message between email [[Server|servers]]. It is not used to retrieve email messages from a server. Instead either [[Internet Message Access Protocol|IMAP]] or [[Post Office Protocol|POP]] is used to retrieve email messages. ==Related pages== * [[Internet Message Access Protocol]] (IMAP) * [[Post Office Protocol]] (POP) {{tech-stub}} [[Category:Application layer protocols]] [[Category:E-mail]]