How to hide extra SMTP headers?

Question

SMTP

Good afternoon,
when sending mail messages, all participants in the transfer are indicated in the headers
(local mailer - another mailer - antivirus.antispam - something else - mail gateway - recipient server)
below is a part of the message in the form in which it will be received by the addressee (names and ip changed)

Delivered-To: [email protected]
Received: by 10.114.11.170 with SMTP id r10csp20143ldb;
        Thu, 9 Jan 2014 02:40:49 -0800 (PST)
X-Received: by 10.15.36.135 with SMTP id xxxxxxxxxxxxx.xx.xxxxxxxxxxxxxx;
        Thu, 09 Jan 2014 02:40:49 -0800 (PST)
Return-Path: <[email protected]>
Received: from mailhost2.gateway.ru (mailhost1.gateway.ru. [217.xxx.xxx.xxx])
        by mx.google.com with ESMTPS id xxxxxxxxxxx.xxx.xxxx.xx.xx
        for <[email protected]>
        (version=TLSv1 cipher=RC4-SHA bits=128/128);
        Thu, 09 Jan 2014 02:40:49 -0800 (PST)
Received-SPF: pass (google.com: domain of [email protected] designates 217.xxx.xxx.xxx as permitted sender) client-ip=217.xxx.xxx.xxx;
Authentication-Results: mx.google.com;
       spf=pass (google.com: domain of [email protected] designates 217.xxx.xxx.xxx as permitted sender) [email protected]
Received: from MAILSERVER3.domain.ru ([xxx.xxx.xxx.xxx])
  by mailhost2.gateway.ru (8.13.8/8.13.8) with ESMTP id xxxxxxxxxxxx
  for <[email protected]>; Thu, 9 Jan 2014 14:40:48 +0400
X-IronPort-AV: E=Sophos;i="4.95,630,xxxxxxxxxxx"; 
   d="scan'208,217";a="xxxxxxxx"
Received: from MAILSERVER2.domain.ru  ([xxx.xxx.xxx.xxx])
  by MAILSERVER3.domain.ru with ESMTP; 09 Jan 2014 14:40:49 +0400
Received: from MAILSERVER1.domain.ru 
 ([::1]) with mapi id 14.03.0123.003; Thu, 9 Jan 2014 14:40:47 +0400
From: <[email protected]>
To: <[email protected]>

Question for connoisseurs,
how to hide the entire chain of mailers, except for the last mail gateway (mailhost2.gateway.ru)??
IronPort C160 AsyncOS mail gateway ver. 8.0.0
Thank you.

Answer 1

On IronPort in the CLI look at the stripheaders filter

mail3.example.com> stripheaders
Not currently stripping any headers.
Choose the operation you want to perform:
- SETUP - Set message headers to remove.
[]> setup
Enter the list of headers you wish to strip from the messages before they 
are delivered. Separate multiple headers with commas.
[]> Delivered-To
Currently stripping headers: Delivered-To
Choose the operation you want to perform:
- SETUP - Set message headers to remove.
[]>
mail3.example.com>

Answer 2

What mail server is used before the mail gateway?

Answer 3

Exchange, but cleaning headers must be done on IronPort

Answer 4

Get-SendConnector “Connector Name” | Remove-ADPermission -AccessRight ExtendedRight -ExtendedRights ms-Exch-Send-Headers-Routing -user “NT AUTHORITY\Anonymous Logon”

Answer 5

All of you correctly advised about IronPort except Header
It is necessary to specify in the filter not "Delivered-To" but "Received" in my case.
Thank you!