echo "Testing 123" | mail -s "ECS PostDate Processed" "layton.everson@gmail.com chrish@mycreditcompany.com" -- -r "noreply@mycreditcompany.com" -F "ServerCronJobs"

from root <root@mycompany.com>
to me, chrish, -r, noreply, -F, ServerCronJobs

ls -l /usr/bin/mail
lrwxrwxrwx 1 root root 22 Jan  5  2011 /usr/bin/mail -> /etc/alternatives/mail

ls -l /etc/alternatives/mail
lrwxrwxrwx 1 root root 18 Jan  5  2011 /etc/alternatives/mail -> /usr/bin/bsd-mailx

sudo update-alternatives --config mail