Composing and Sending Email

  • Email can be composed in and sent through one of the e-mail programs, such as Outlook, Outlook Express, Eudora, Mozilla, pine, etc.
  • An Email program, also called Mail User Agent (MUA), defines outgoing (relaying) SMTP server and incoming IMAP or POP3 server.

  • Email can also be sent by directly telneting to port tcp/25 of a server, for example:
     
    telnet node18.rutgers.edu 25
    Trying 192.168.5.38...
    Connected to node18.rutgers.edu.
    Escape character is '^]'.
    220 node18.rutgers.edu ESMTP Postfix (Debian/GNU)
    HELO me@here.com
    250 node18.rutgers.edu
    MAIL FROM: jj@jj.com
    250 Ok
    RCPT TO: mailtest@capone.rutgers.edu
    250 Ok
    DATA
    354 End data with < CR>< LF>.< CR>< LF>
    To: some_guru@somewhere.com
    From: pp@pp.com
    Subject: Forged e-mail
    
    Hey,
    The "To:" and "From:" are non-existent, but you still get the e-mail.
    bye, bye
    .
    250 Ok: queued as 4653B14112
    QUIT
    
    

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