Add this as the first line of crontab:
MAILTO=address1@host.com,address2@host.co.uk
method 2 - for specific commands
Add this line anywhere near the top:
NOTIFY_LIST="address1@host.com,address2@host.co.uk"
Use this for the command:
00 09 * * * run_command | mail -s "command has run" $NOTIFY_LIST