Contact this author form

Hi,

Does anybody know of a plugin or snippet that allows me to have a “contact this author” button on a multi author site?
Example:
John Doe writes a post, then there’s a “About this author box” (bio).
Below that I would like a “contact this author” link that would link to (load?) a contact form that sends an email to that author (so his email address stays hidden)

Been browsing through the plugins and forums and have not found one.

Thanks