On occasion, we write code that sends email. Sometimes, it actually works the first 
time.
More often, we need to figure out why not.

While it's nicest to have the computer emulate what the human would get bored doing, 
sometimes it helps to have the human do what the computer can't quite seem to do on 
its own.

For that reason, we sometimes resort to manual telnet sessions with a remote mail 
server.

Simple manual telnet session with mail host
Uppercase/lowercase does not appear to be significant.

You do/type this			Server responds with
--------------------------------------------------------------------------------------
-------
Telnet to hostname on port 25 		220 (then identifies itself)
HELO your_domain_name or whatever 	250 (followed by human readable message)
MAIL FROM:you@hostname.com 	 	250 is syntactically correct (or similar)
RCPT TO:them@someplace_else.com  	250 is syntactically correct
DATA 					Tells you to send data then CRLF period CRLF end		
Type message then a period on line	250
QUIT 					Signoff message