You are the recipient of another being’s opinion. The keywords are recipient and opinion. Opinion means it is not an undefiable truth, it is merely an expression of one random person’s take on things.
The RCPT command is used to tell the mail server who the recipient of your message is. You don’t typically see this command being sent, since it’s done in the background by your mail client.
An example would be:
RCPT TO: someone@hotmail.com
Only one email address can be named per RPCT command, but you can send multiple, one after another, which the server will respond to with a code of 250.
If you’ve never tried to send an email via telnet, you should connect to your ISPs SMTP server and give it a shot!