qmail reply to header and failure notices

[yehudigt]

I'm receving tons of failure notices due to an incorrect setting of return-path and reply to headers.
Plesk 10.1.1 linux on centOs 5

this is an example where you can see that return path automatically sets @ns220846.ovh.net which is the hostname.
the same script was actually working fine on a cpanel server. This issue started as I transferred the domains on this new server.
How can I fix this?

Return-Path: <email@ns220846.ovh.net>
Received: (qmail 12803 invoked by uid 502); 15 Feb 2011 00:39:17 +0100
To: EasyFarma.it <mailto@gmail.com>
Subject: [EasyFarma.it] Richiesta Informazioni Prodotto
From: sender@gmail.com <sender name@ns220846.ovh.net>
Reply-To: sender@gmail.com <sender name@ns220846.ovh.net>
Date: Tue, 15 Feb 2011 00:39:17 +0100
X-LibVersion: 3.3.2
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: quoted-printable
Message-ID: <20110214233917.5916.747024925.swift@www.easyfarma.it>

 

[IgorG]

Try to find reason of this problem in main Plesk maillog /usr/local/psa/var/log/maillog

 

[yehudigt]

sincerely I took a look at the log, but wasn't able to fina anything about this issue.
if you take a look at these two lines:

From: sender@gmail.com <sender name@ns220846.ovh.net>
Reply-To: sender@gmail.com <sender name@ns220846.ovh.net>
the first part is ok "From: sender@gmail.com "
but then it sets a strange address within the tag :<sender name@ns220846.ovh.net>

the correct one should be:
From: sender@gmail.com <sender@gmail.com>
Reply-To: sender@gmail.com <sender@gmail.com>

I think that this must be some setting of qmail