@ thvinothan
I recommend that you check out a couple of Solution Articles by MSFT Roopa S that may help with your Mail Delivery concern. To view them, please access the links below.
Please try the troubleshooting steps in the “Not receiving e-mail from contacts” article.
http://windowslivehelp.com/solutions/settings/archive/2009/02/18/not-receiving-e-mail-from-contacts.aspx
I also suggest that you check whether your reply-to address feature has been enabled. Please see “How to set or change reply address” for instructions on how to disable the reply-to address set in your account.
http://windowslivehelp.com/solutions/settings/archive/2009/03/03/how-to-set-or-change-reply-address.aspx