Paul Smith wrote:
All I can figure out so far is that the expiry of a
message implies it's possibly not quite as important,
urgent or valid to the sender/recipient/some-other-
person as it would have been before it expired.
I'm not sure that's a tight enough definition :)
From a sender's POV "expired" could mean "if you read
this mail later whatever I wanted is not more relevant".
Examples:
"confirm your subscription to list X in the next 3 days"
"special offer valid until 2008-06-30"
"I'm out of office until 2008-07-18"
Good examples apparently require some kind of mailbot
on the sender's side. It is less useful for ordinary
(sending) MUAs, e.g., "happy birthday" with Expires:
makes no sense, or does it ?
Frank