Simple Mail Transfer Protocol

Blue arrows can be implemented using SMTP variations.

Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission. First defined by RFC 821 in 1982, it was last updated in 2008 with the Extended SMTP additions by RFC 5321—which is the protocol in widespread use today.

单词	Simple Mail Transport Protocol
释义	Simple Mail Transport Protocol 英语百科 Simple Mail Transfer Protocol Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission. First defined by RFC 821 in 1982, it was last updated in 2008 with the Extended SMTP additions by RFC 5321—which is the protocol in widespread use today.
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Simple Mail Transport Protocol

Simple Mail Transfer Protocol