With today's rampant level of fraud, it is imporant to keep your personal out of the unwanted eyes.
To combat this domain registrar had implmented something called Whois Privacy. Whois Privacy will hide your Whois information behind a proxy. Making your personal information less visible to the public.
When Whois Privacy is turned on, whenever somebody querying for your domain's Whois record will only see set of generic contact information along with a special email address
With this special email address, people who wish to contact you via the Whois record can still do so but their emails is first filtered by this special email address before being forwarded to you. Which means your email address is not exposed to the whole world to see.