If you find a vulnerable SMTP server that does not require authentication you can telnet or netcat to it on port 25.
First greet the server with HELO thedomain.com
Next start a message with the sender MAIL FROM: firstname.lastname@example.org
And set the recipient RCPT TO: email@example.com
And start the body by typing DATA
Enter the subject with SUBJECT: my subject
Then type in the body of the email you want
Then type . and hit <ENTER> to send the email
Then get out of there with QUIT
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