in message
Delivery receipts are the purview of the mail servers you send the
mail to, and many do not support delivery receipts. Many more are
starting to ignore delivery receipt requests, probably as a privacy
issue.
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Probably more due to the fact that all e-mails get a delivery
receipt - if the form of the *lack* of negative feedback. Delivery
receipts only mean that the destination mail host accepted the e-mail.
If that mail host rejects the e-mail then the sender gets back an NDR
(non-delivery report) as negative feedback. So why bother to send
positive feedback when the negative feedback suffices to determine if
the e-mail got delivered. There is no need to send both positive and
negative feedback. If you don't get negative feedback, that is as
good an indicator as you will get that your e-mail got delivered. If
your e-mail gets lost along the way then it won't arrive for the
destination mail host to send back positive feedback, anyway.
