is?
The first Arpanet connection was a simple Telnet logon connection. FTP was developed at the same time but was the 2nd to be actually used. Email came “much later”. Link.
aye! thx! i found that link but i understood nothing from it
FWIW, the first email app was a simple combination of a local (single machine) program for sending messages to users of that machine, and a file transfer mechanism. Put the two together, and you can send a message to a user on another machine.
Wouldn’t the first internet protocol have been…Internet Protocol (IP)? A wizard can correct me if I’m wrong, but I don’t think that there’s anything in the specs of Telnet, FTP, SMTP, HTTP, etc that requires them to run on IP. It’s just more convenient to have the packet switching and addressing mechanism, which is what IP is, to be the same across the board.
TCP/IP
It depends what you mean by “first Internet protocol” anyway. The original Arpanet stuff did not run on IP at all.