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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.linux.class 25
Trying 192.168.5.38...
Connected to node18.linux.class.
Escape character is '^]'.
220 node18.linux.class ESMTP Postfix (Debian/GNU)
HELO here.com
250 node18.linux.class
MAIL FROM: jj@jj.com
250 Ok
RCPT TO: mailtest@capone.linux.class
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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