1. How does a simple protocol like the email protocol SMTP work 1. open telnet & do remote login in to the system you want to send email to

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

4. 7. this is the response from the mail server on cis.njit.edu [ cis is an alias for homer] 8. 220 is a code that 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