Sending mail via telnet

1. Telnet to hostname on port 25.
   220 (then identifies itself – possibly with several lines of 220 + text)

2. HELO your_domain_name or whatever
   250 (followed by human readable message)

3. MAIL FROM:you@hostname.com (ie, your email address)
   250  is syntactically correct (or similar)

4. RCPT TO:them@someplace_else.com (email address you want to send to)
   250  is syntactically correct

5. DATA
   Tells you to send data then CRLF period CRLF at end

6. You type your message then CRLF period CRLF (ie, type a period on a line by itself then hit ENTER)
   250

7. QUIT
   Signoff message

Have a nice day 🙂