Contact form in public site with email

Hi,

I'm trying to make a contact form in a public site, the form need to send an email to the site administrator when an anonymous user submit the contact form, what options do i have in SharePoint to achive this:

I review this options:

• A SharePoint List with alerts (The alerts doesn't work in public site)
• A Workflow with a email action (The workflow doesn't start in a public site)
• Sandbox solution (Can't use SPUtility.SendMail)

There are any options in SharePoint?

Thanks,

Esteban Lalinde