On Fri, Jan 06, 2012 at 10:59:25PM -0500, Shawn H Corey wrote:
> On 12-01-06 10:48 PM, Brenda J. Butler wrote:
> > On Fri, Jan 06, 2012 at 10:42:47PM -0500, Brenda J. Butler wrote:
> >> On Fri, Jan 06, 2012 at 10:28:34PM -0500, Shawn H Corey wrote:
> >>> On 12-01-06 10:12 PM, Brenda J. Butler wrote:
> >>>> The email protocol does not include any way to check if the
> >>>> email has been read.
> >>>>
> >>>> People have used other tricks to tell if the email has been opened.
> >>>> One is the "include a link and if the person clicks on it, the
> >>>> email has been read".
> >>>>
> >>>> Another is the "include a picture and if that picture is downloaded,
> >>>> the picture has been read".
> >>>
> >>> Won't work. I have a filter on my email that checks to see if you're on
> >>> my black list, and if so, sends it directly to trash and marks it read.
> >>> I never see it.
> >>
> >> This "marks it read" feature is for you to know which emails you have
> >> read. It is not for the sender to know whether you have read their
> >> message. That is a separate feature, implemented differently.
> >
> > More explicitly:
> >
> > The "emails I've read" information is kept locally on your machine,
> > about which emails that you've already received have been read
> > by you. It is not part of the email exchange protocol at all.
>
> If my machine marks it as read and sends back a receipt saying so, the
> sender will think I have read it when in fact, I have not. There is no
> way to guarantee a person has read the mail. The only thing you can tell
> is that somewhere along the line a machine has marked it as read. The
> only way to guarantee that the mail has reached the recipient's machine
> is to search that machine for it. Email is *not* guaranteed.
You cannot guarantee that a registered letter has been *read* by the
intended recipient either. It is guaranteed to have been *received* by
*someone who signed for it* at the destination though. For a machine,
that isn't saying much.
> Shawn
slainte mhath, RGB
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