crontab not working properly

i have created a shell script shown below :

Its working properly when i executing through shell

but when i executed through crontab.

contents (body) of the mail is empty


Can u make out any problem ?

dflogs.sh
--------------
cat rs.log | grep '<' > /data/rs/applogs/dflogs.txt
mail -s "test" jaisonshereen@gmail.com < /data/rs/applogs/dflogs.txt
 
 
Crontab -e 
---------
 
5,10,15,20,25,26,27,28,29,30,31,32,33,34,35,40,45,50,51,52,53,54,55,56,57,58,59  * * * * /data/rs/applogs/dflogs.sh

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