[ietf-dkim] "Best Before" vs. "expiration" date

[Michael Thomas]

Paul Hoffman wrote:

> At 3:32 PM -0700 4/24/06, Jim Fenton wrote:
> More good questions. "I, the sender, want this to not be able to be 
> validated after this date" is all well and good, but the sender's 
> wishes go directly against the recipient's wishes, which are to have 
> as many validated messages as possible.

That's not correct. The receiver's motivation is to defend itself. 
Validating messages
a priori does not do that. If a sender through its own policy says 
"don't trust/honor/blame me
this after this time", why should a receiver not honor that? That 
information only negatively
reflects on the message,  so a receiver should be happy to know.

       Mike