Return Receipts

[Michael T. Babcock]

I'm aware of how qmail currently handles receipts, but am wondering if it
would be possible (of course ;-) to (by adding a header?) request that
qmail-remote or qmail-local generate a return-receipt-verified E-mail once
they succeeded?

It doesn't seem that difficult to return a confirmation message (on request)
once the sending server has successfully delivered the message to where it
was going.  The user may not have received it yet, etc., but it is sent.