You have an Exchange Server 2010 SP1 organization named contoso.com.

All users have the @contoso.com e-mail address suffix.

You discover that both anonymous and authenticated users can post content to a public folder named folder1 by sending e-mail messages to folder1@contoso.com.

You need to prevent all users from posting content to folder1 by sending e-mail.

A.
From Outlook Web App (OWA), modify they properties of Folder1.

B.
From the Exchange Management Shell, modify the permossions of the default Receive connector.

C.
From the Public Folder Management Console, modify the properties of Folder1.

D.
From the Exchange Management Console, modify the properties of the Public Folder database.

Explanation:
(Exhibit)