ok, let's have a bit of harmless fun and ports shall we? Let's explore port 25. Port 25 is the SMTP port. In english, that means you send email through that port. I see you have an AOL account yes? well then, let's send an email to your aol account.
open up telnet and connect to
mailin-01.mx.aol.com is one of their SMTP servers and port 25 is the port providing the service.
After you've connected type the following (the ## lines are just descriptions of the commands)
## First we identify ourselves
## Now we specify the account it was sent from. this can be just about anything
## This is mailbox the email is being sent to
## Now we indicate that we wanna start writing the email
## Now we type the headers and the email. You MUST end it with a . on a blank line
From: Telnet boy
Subject: This is my telnet test!
Hi, this is my email body.
## Now we send the QUIT command. The email is sent
Now here's a real life example as I sent you an email via telnet.
220-rly-yb03.mx.aol.com ESMTP mail_relay_in-yb3.4; Mon, 14 Oct 2002 21:04:15 -0400
220-America Online (AOL) and its affiliated companies do not
220- authorize the use of its proprietary computers and computer
220- networks to accept, transmit, or distribute unsolicited bulk
220 e-mail sent from the internet.
250 rly-yb03.mx.aol.com OK
550 REQUESTED ACTION NOT TAKEN: DNS FAILURE
354 START MAIL INPUT, END WITH "." ON A LINE BY ITSELF
From: blah <email@example.com>
To: blah4 <firstname.lastname@example.org>
221 SERVICE CLOSING CHANNEL