eMail from console
One Line
echo "<mail-text>" | mail --subject="<mail-subject>" <receiver-email> &
From File
cat <mailbody_file> | mail --subject="<mail-subject>" <receiver-email> &
What I do, what I have learned, what I use
echo "<mail-text>" | mail --subject="<mail-subject>" <receiver-email> &
cat <mailbody_file> | mail --subject="<mail-subject>" <receiver-email> &