A common source of confusion for Visualforce developer is configuring a Force.com site to allow unauthenticated access to Salesforce records and specific fields. This is usually configured via the Profiles menu located at Your Name | Setup | Administration Setup | Profiles. However, access to records and fields for a Force.com site is configured via the setup page for the site in question.
In this recipe we will configure the Force.com site created in the first recipe to allow public access to contact records. We will then create a Visualforce page that allows a visitor to enter an e-mail address into a form on the Force.com site and extract the contact record matching the e-mail address, displaying the First Name, Last Name, and Email fields from the contact record.
This recipe requires that you have already completed the Creating a Site recipe, as it relies on the custom domain and Force.com site created in that recipe.
