The last thing you need when you are looking for a job is that all you can reply to all your important mails asap. However this is the worst jobsite I have ever seen in that matter. There are a lot of spam mailing services which are connected to this website. The day I registered with Naukri.com, I Started receiving atleast 50 junk mails per day. All claims to give you million dollars or you won lottery or you got PR in USA and what not.. I would not recommend this website at all due to this reason.
May be if you want to register for them, DONT give them your primary email ID, Create a new email ID and then give it. As there will be tons of spammer, who will send you all these junk mails. And remember, "There are no free lunches". In this world nobody gives anything for free.