Winsock1.SendData data string meanings ????

[Al Smith]

I think I know what most of the following does but could someone explain?
e.g. "MAIL FROM:" vs "FROM:", "RCPT TO:" vs "TO:", etc.

Winsock1.SendData _
"HELO "
"MAIL FROM: "
"RCPT TO: "
"DATA"
"TO: "
"FROM: "
"SUBJECT: "
(Message Text)
"QUIT"

Thanks,
Al.


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