Verifying Email Addresses in Real Time?

Hey Marketo Friends–

We're working on a referral program where our partners can submit leads to us. The partner would get credit for each lead submitted, so it's important for us to be able to credit the correct partner with each submission. To accomplish this, we were going to try and have a gate before the referral submission page that verified whether or not they were a parter by checking their email address.

Question: Is there a way to make a form verify that an email address exists in SFDC and that the "Type" associated with that email address = "Partner"?

Thank you!