On Mon, Oct 26, 2009 at 9:32 AM, Yao Ziyuan <yaoziyuan@???> wrote:
> Passive Spam Revocation (PSR)
>
> Currently almost all mail systems (e.g. Hotmail and Gmail) use a spam
> filter, which can drop good and important messages.
>
> I propose an optional feature for current mail systems. The main idea
> is if a message is considered spam, this spam status can be tracked by
> the sender (but not sent to him directly, as the From field can be
> faked). The message can be re-marked as "not spam" if the sender can
> solve a CAPTCHA.
>
> STEP 1: A is going to send B a message. A's mail client generates a
> random code and puts it in a custom field in the outgoing message's
> header:
> Code: <random code>
> STEP 2: A's mail client sends the message, waits 30 seconds, and then visits:
> https://spamstatus.<B's mail domain>/?msgid=<Message-ID>&code=<Code>
> This page displays one of these possible "spam statuses":
> * MESSAGE CONSIDERED SPAM. (A CAPTCHA is also presented below.)
> * MESSAGE CONSIDERED NOT SPAM.
> * PENDING. PLEASE TRY AGAIN LATER.
> * All other responses mean B's mail system doesn't support this feature.
> In the first case, A's mail client will report the status and the
> CAPTCHA to A. A can choose to solve the CAPTCHA to prove the message
> is not spam.
Showing a message's spam status to the sender can be bad, if he is
really a spammer. So the page can also return:
* SPAM STATUS HIDDEN. (A CAPTCHA is also presented below.)
This means the sender can solve the CAPTCHA to see the status and
change it to NOT SPAM.
>
> Like the idea? Here is the official Google group for it:
> http://groups.google.com/group/passive-spam-revocation
>
> Regards,
> Yao Ziyuan
> http://sites.google.com/site/yaoziyuan/
>
