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Telnet to the SMTP server on port 25.
In the listing below;

S:   Is the Sender,
OS: Are Optional lines typed by Sender,
AS: Alternative Sender lines,
R:   Is the SMTP server's Response,
#    Is a comment.

S: HELO . R: 250 mailserver.destinationcom.com Hello mailhost.sendercompany.com [127.0.0.1], pleased to meet you

S: MAIL FROM:<sender@sendercompany.com>
AS: MAIL FROM:<>
    # Therefore a null sender address.
R: 250 OK

S: RCPT TO:<friend@destinationcom.com>
R: 250 OK

S: RCPT TO:<oldfriend@destinationcom.com>
R: 550 No such user here

S: RCPT TO:<anotherfriend@destinationcom.com>
R: 250 OK

S: DATA
R: 354 Enter mail, end with "." on a line by itself

OS:To: Friend Real Name <friend@destinationcom.com>
OS:From: Sender Real Name <sender@sendercompany.com>
OS:Errors-To:<adminperson@sendercompany.com>
    # Only useful for mailing lists where you want to redirect errors away from the list.
OS:Reply-To:<altsendersaddress@sendercompany.com>
    # Reply to a diffrent address, than the from address. OS: Content-Type: text/html; charset="iso-8859-1"
    # To send HTML formated email, please don't do this. OS: SUBJECT: a test

S:
# Yes the above line was a blank line, this seprates the headers from the message.

S: Blah blah blah...
S: ...etc. etc. etc.
S: .
R: 250 OK