How does a simple protocol like the email protocol SMTP work

1. Open telnet connection

Do remote login to the system you want to send email to

Note: You probably will have to telnet to your AFS account firstAnd then from there telnet to a mail server as described in the following. Once connected to your account (such as togould.njit.edu) you can then: telnet gould.njit.edu 25

make itechowhat 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 email server listens om

4. Select this type of terminal option [VT100 option may also work]

5. click connectto logon

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

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 25

10. 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 email address in <...>

12. system says my address is OK

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 serveracknowledges the target emailaddress is on its server

15. I got error message from serverbecause 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