Suppose that you have some text in message.txt. A possible way to send that text in a mail to
someaddress@foo.bar is this:
cat message.txt | formail -A "To:
someaddress@foo.bar" | sendmail -oi -t
This requires that you have procmail installed; and sendmail should be correctly configured to be able to send mails.
If you do not operate your own mail server (which would require an own domain name), then you should configure sendmail to send mails via your ISP's smtp server (enter its name in line "smartrelayhost" line in sendmail.conf).
