Reporting-MTA / certify email

Several email servers today report, when asked from client programs, a sort of certify email like:

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Reporting-MTA: dns; vs1123.xxdomain.it
Received-From-MTA: DNS; cp-out9.libero.it
Arrival-Date: Mon, 26 May 2008 11:18:13 +0200

Final-Recipient: RFC822; info@mydomain.com
Action: delivered (to mailbox)
Status: 2.1.5
Last-Attempt-Date: Mon, 26 May 2008 11:18:14 +0200
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If you try with our server it responding:

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Reporting-MTA: dns; cp-out11.libero.it
Received-from-MTA: dns; PC000182 (151.46.162.113)
Arrival-Date: Mon, 26 May 2008 11:26:38 +0200

Final-Recipient: rfc822; p.romani@mydomain.com
Action: Relayed
Status: 2.0.0
Remote-MTA: dns; mail.mydomain.com
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Obviously the aswers are totally different, because in first case is the destination server that creating the answers , on second is only the relay server (or end user)
With second one I don't have any guarantee about delivery to mail box.

The best will be an answer when the distination email client program download the email: in this case sender is certain of it.

Is it in implementing this type of service ?