this is what happens every time you send an email, between the receiving server and the transmitting client – it’s kinda cute
the contents of the email are after server says “354 Enter mail…”
Server: 220 hamburger.edu
Client: HELO crepes.fr
S: 250 Hello crepes.fr, pleased to meet you
C: MAIL FROM:
S: 250 email@example.com… Sender ok
C: RCPT TO:
S: 250 firstname.lastname@example.org … Recipient ok
S: 354 Enter mail, end with “.” on a line by itself
C: Do you like ketchup?
C: How about pickles?
S: 250 Message accepted for delivery
S: 221 hamburger.edu closing connection