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Nope, SMTP is the older one. RFC 821 standardized SMTP, RFC 760 created IPv4, and in fact if you read RFC 801 it required a switchover from the previous Network
by zinekeller 4y ago
Nope, SMTP is the older one. RFC 821 standardized SMTP, RFC 760 created IPv4, and in fact if you read RFC 801 it required a switchover from the previous Network Control Protocol (NCP) to then-new TCP/IP on the start of 1983. As the grandparent points out:
> RFC numbering only indicates the order in which these protocols were standardized (or at least proposed for standardization), not when they were first used.
Even today, many things are de-facto implemented before standardized so I personally don't think that it's correct to look at the RFC date as the date to consider.