LindaSmith1's answer is inaccurate. When you use the contact feature on HubPages, it does reveal your email address to the person you are contacting. That's why many people do not respond to emails they receive via that feature.
You'd have to sign up for a second email, other than the one you consider your personal email, and then change your account registration to use that new email.
But by emailing hub authors directly, they will be shown whatever email is associated with your account.