Ask HN: Would you use this service?

How many times have you received an email that started:

  > Following recent correspondence, ...

Sometimes it's true, but mostly it's a lie.

If someone started a database of reports of companies that lied in this fashion, would you be interested? After all, information that a company tells lies like this is a suggestion that they will lie about other things as well.

What safeguards would you want to see? How would you gather the data? How would you make it available? How would you charge for it?

I don't have time, possibly it's not worth anything, but I'd really like to see this sort of blatant lying exposed.