220 rigel SMTP ready, Who are you gonna pretend to be today?

helo a.b.com
250 rigel Is thrilled beyond bladder control to meet a.b.com

mail from: a@b.com
250 sender is a@b.com, (yeah sure, it's probably forged)

rcpt to: you@somewhere.com
250 recipient you@somewhere.com, I know them! they'll just *LOVE* to hear from you!

data
354 OK, fire away. End with <CRLF>.<CRLF>

hello world!
.
250 Whew! Done! Was it as good for you as it was for me?

blabla
500 Bloody Amateur! Proper forging of mail requires recognizable SMTP commands!

quit
221 It's been real. Take off Eh!