Cron sends mail after finishing job. How to turn off that?

[Kevac Marko]

[root at rknight kernel]# cat /var/spool/cron/ffsearch
# DO NOT EDIT THIS FILE - edit the master and reinstall.
# (/tmp/crontab.21988 installed on Mon May 31 19:06:01 2004)
# (Cron version -- $Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $)
MAILTO=""
0,5,10,15,20,25,30,35,40,45,50,55 * * * * /home/ffsearch/online_check.pl 
 > /dev/null
0 20 * * * /home/ffsearch/bin/ffsearch.pl -c > /dev/null
0 0,4,8,12,16 * * * /home/ffsearch/bin/ffsearch.pl -i > /dev/null

but mail still coming =( Now to ffsearch user.