Plesk 11.x / Windows :: Dedicated IP For Email

The VPS have a main domain with IP for example : 127.0.0.1 and all other domain have the same ip.

Then I create a new domain, but with dedicated IP, for example : 127.0.02

When main domain or others domain send and email, he header is something like this :

Code:
Delivered-To: [B]email-to-send@gmail.com[/B]
Received: by 10.68.89.69 with SMTP id bm5csp111327pbb;
Mon, 10 Mar 2014 11:35:28 -0700 (PDT)
X-Received: by 10.194.82.35 with SMTP id f3mr33039278wjy.36.1394476527733;

[Code] ...

When the domain with dedicated IP send and email, the header is the same, but I need the header change the ip, for example this :

Code:
Delivered-To: [B]email-to-send@gmail.com[/B]
Received: by 10.68.89.69 with SMTP id bm5csp111327pbb;
Mon, 10 Mar 2014 11:35:28 -0700 (PDT)
X-Received: by 10.194.82.35 with SMTP id f3mr33039278wjy.36.1394476527733;

[Code] .....

Why all domain whit shared or dedicated ip get (main-domain.com 127.0.0.1)