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How does a simple protocol like the email protocol SMTP work

How does a simple protocol like the email protocol SMTP work. Note : You probably will have to telnet to your AFS account first And then from there telnet to a mail server as described in the following. Once connected to your account (such as to

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How does a simple protocol like the email protocol SMTP work

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  1. How does a simple protocol like the email protocol SMTP work Note: You probably will have to telnet to your AFS account first And then from there telnet to a mail server as described in the following. Once connected to your account (such as to gould.njit.edu) you can then: telnet gould.njit.edu 25 1. Open telnet connection Do remote login to the system you want to send email to

  2. Use the command prompt to initiate telnet or a GUI telnet tool Like the following: make it echo what you type

  3. 3. This is the port that email server listens om 2. This is the remote system 5. click connect to logon 4. Select this type of terminal option [VT100 option may also work]

  4. time/date 7. This is response from the mail server on cis.njit.edu [ cis is an alias for homer] 8. 220 is a code --- means everything is OK so far

  5. 9. This is what I type in as my part of the dialog I am saying HELO to the mail server on that system on port 25 10. The system responds with an Acknowledgement

  6. 11. I then identify who I am - this is not verified & could be spoofed I am saying MAIL FROM: followed by my email address in <...> 12. system says my address is OK

  7. 13. I then identify who I am sending email to on the server - in this case I just sent the mail to myself I say: RCPT TO: followed by email address I am contacting 14. the mail server acknowledges the target email address is on its server

  8. 15. I got error message from server because I backspaced then I re-entered command to indicate I am about to send the data or contents of the email the server was satisfied & said I can enter the email - terminating the message with a Period. 16. I entered the message here & ended with period 17. server accepted the email 18. I then typed QUIT [not shown] to end session

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