Sending Cron Mail to other accounts

I need to send my cron mail to other accounts. I edited the /etc/aliases file and added the line the alias correctly into the file. I then ran newaliases to sort the file out. I have a mail server running on another computer in the network . Where must I set it up that the cron mail will send the mail to my other account. My linux machine is p2.local. The Mail server is p3.local. I need to send cron mail to root@p3.local Thanks Ray Booysen