Re: Intent to revive "expires" header from draft-ietf-mailext-new-fields-15

On Tue, 2008-07-29 at 21:49 -0400, Hector Santos wrote:
> Michael Welzl wrote:
> 
> >>     The Expires header indicates a date-time, at which this
> >>     message expires. The field can be used both to limit and to
> >>     extend the life of a message. User agents and servers which
> >>     employ automatic purging of old messages MAY let this field
> >>     influence the purging process. There is no requirement that a
> >>     user agent must suppress expired messages or make them
> >>     inaccessible to their owners.
> > 
> > Let's analyze the paragraph:
> > 
> > * sentence 1 is fine with me.
> > 
> > * sentence 2, "can be used both to limit and to extend" seems
> >   confusing and strange to me.
> 
> Not sure why that is odd to you.
> 
> If you have accepted the reality that backends already expire messages 
> regardless of flags or user permission, the question is how would this 

I changed my mind yesterday about sentence 1: it waters
the other statement that I want to have in there, about
only doing this when it's explicitly allowed by the user.

So, regarding "acceptance of this reality", sure I accept
that such things happen, but this is not what we design for.

Cheers,
Michael