TCP IP Illustrated

220 noaoedu sendmail 41sag noaog89 ready at mon 19

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Unformatted text preview: when this flag is specified. Lines beginning with >>> are commands sent by the SMTP client, and lines beginning with a 3-digit reply code are from the SMTP server. Here is the interactive session: sun % mail -v rstevens@noao.edu To: rstevens@noao.edu Subject : testing 1, 2, 3. . Sending letter ... rstevens@noao.edu... invoke our user agent this is output by user agent we're then prompted for a subject user agent adds one blank line between headers and body this is what we type as the body of the message we type a period on a line by itself to say we're done verbose output from user agent following is output by MTA (Sendmail) Connecting to mailhost via ether... Trying 140.252.1.54... connected. 220 noao.edu Sendmail 4.1/SAG-Noao.G89 ready at Mon, 19 Jul 93 12:47:34 MST >>> HELO sun.tuc.noao.edu. 250 noao.edu Hello sun.tuc.noao.edu., pleased to meet you >>> MAIL From: <rstevens@sun.tuc.noao.edu> 250 <rstevens@sun.tuc.noao.edu>... Sender ok >>> RCPT To:<rstevens@noao.edu> file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/smtp_sim.htm (2 of 23) [12/09/2001 14.47.52] Chapter 28. SMTP: Simple Mail Transfer Protocol 250 <rstevens@noao.edu>... Recipient ok >>> DATA 354 Enter mail, end with "." on a line by itself >>> . 250 Mail accepted >>> QUIT 221 noao.edu delivering mail rstevens@noao.edu... Sent this is output by user agent sent. Only five SMTP commands are used to send the mail: HELO, MAIL, RCPT, DATA, and QUIT. We type mail to invoke our user agent. We're then prompted for a subject, and after typing that, we type the body of the message. Typing a period on a line by itself completes the message and the user agent passes the mail to the MTA for delivery. The client does the active open to TCP port 25. When this returns, the client waits for a greeting message (reply code 220) from the server. This server's response must start with the fully qualified domain name of the server's host: noao.edu in this example. (Normally the text that follows t...
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