Changing the “From” address in emails generated by scripts

Here is a convenient way to set the From address in emails

generated automatically (for example report jobs run from cron):

echo be good | mutt -s 'message from Santa' -e 'my_hdr From:

Santa.Claus@NorthPole.org'

mutt's my favorite command-line emailer. It is featureful and highly customizable.