Re: a header authentication scheme

Laird Breyer writes:
> Yet another way of inserting the requisite unguessability in a 
> Received line might be a specially formatted comment. This would not 
> require the ID, and if the comment was present, it would be a 
> guarantee of sorts from the MTA that the token is unguessable (so the 
> MTA authors would not have to change their ID scheme).
It would be the same as the ID: Optional, sometimes present. The major 
differences are that it'd be present in 0% instead of 99% of the cases 
to start with, and that it would require evil parser hacks to 
distinguish that comment from other comments.
Arnt