Change the “From:” address in Unix “mail”

Question

Sending a message from the Unix command line using mail TO_ADDR results in an email from $USER@$HOSTNAME. Is there a way to change the \"From:\" ad

Answer 1

echo "body" | mail -S from=address@foo.com "Hello"

-S lets you specify lots of string options, by far the easiest way to modify headers and such.