New anon mailer idea?

[Anonymous]

> Graham Toal's suggestion for automatic insertion of an encrypted
> return address block is interesting.  We had some discussion here
> last year of a similar approach, although Graham's twist of using
> a symmetric rather than PK cypher for the return address is new.
[...]

This is new?  I thought Matt Ghio's remailer at andrew.cmu.edu did this
already!?!?