Cron configuration on Mavericks
This should be working and is certainly working on my Mavericks box.

If you don't have a "MAILTO" line in the crontab then output should get sent to the owner of the crontab. 

Are you sure the job actually outputs something? Have you tried putting a job in the crontab that will be sure to have some output such as

*/10 * * * * *  /bin/echo "Working fine"


Are you sure you don't have a .forward file in the user home directory?

Have you tried using sendmail to send some mail to the account and see if it gets through.