• telnet www.ecsu.edu 80
• GET /index.html HTTP/1.1
• Host: www.ecsu.edu
• <line feed>

• 200 OK
• 301 Moved Permanently
• 400 Bad Request
• 404 Not Found
• 505 HTTP Version Not Supported

• telnet
• open localhost 25
• helo me
• mail from: <sender@ecsu.edu>
• rcpt to: <receiver@ecsu.edu>
• data
• Message ...
• .
• quit

• openssl s_client -starttls smtp -connect smtp.gmail.com:587 -crlf -ign_eof
• ehlo hello
• auth login
• Type in username and password with base64 format
• mail from: <sender@gmail.com>
• rcpt to: <receiver@gmail.com>
• data
• message ...
• .
• quit