How does a simple protocol like the protocol SMTP work 1. Open telnet connection Do remote login to the system you want to send to 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

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

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

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

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 The system responds with an Acknowledgement

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

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

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 the server was satisfied & said I can enter the - terminating the message with a Period. 16. I entered the message here & ended with period 17. server accepted the 18. I then typed QUIT [not shown] to end session