As the title says, this is an anonymous way of having a voice.
If there are questions, concerns, feedback, praise or complaints that you don't feel comfortable making on the forums or private messages, this is a way to do it.
What happens is that the content of the message is sent in an email to the current site heads. The site heads don't see who it is from, and have no one way of finding that out.
Upon receiving the email, they will discuss it amongst themselves, and then make a reply on the forums. The original message will be included, without censorship, and each point should be addressed.
This provides a way for the user to be addressed with their anonymity intact, as well as for the website to see the responses from the site heads.
It also allows the other users to reply back to the forum post with their own thoughts, and feelings.