yuppy.... got my answer
there was a minor mistake..
Signing in using application-specific passwords
http://support.google.com/accounts/bin/answer.py?hl=en&answer=185833
I was using google mail apps password..
name MY NAME
enabled YES
server address pop.gmail.com
port 995
use SSL YES
username mail@xyz.com.np (of the gmail)
password ********** (of the gmail)
minutes between download 3
Deliver to receipients in MIME headers YES
Retrieve date from Received header YES
Do not Delete Messages YES
Instead of password of the gmail use the application-specific passwords http://support.google.com/accounts/bin/answer.py?hl=en&answer=185833 =>> click the link for Singing up for Application specific password