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.
/usr/bin/mail
will send actual mail over the internet from the command line to real mail addresses. Would that be OK or do you need it to only send mail to an account on the local host?