An outside sender using MS Exchange sent a calendar invite to two addresses. Both addresses' inbox are on the same Zimbra server, yet the body of the email is different. Will Zimbra or any other mta alter the contents of the email with the exception of the headers while in transit?

I believe this is a result of the sender's email client configuration, but I'd like to solicit responses from the Zimbra community.

Thank you for your time.


Date: Mon, 10 Sep 2012 12:15:10 -0400
From: "XXXX" <XXXX@XXXX.XXXX>
Subject: XXXX
To: XXXX@XXXX.XXXX, "XXXX, XXXX" <XXXX@XXXX.XXXX>,
XXXX@XXXX.XXXX
Message-id:
<501E466D240EE74A9B908A0AFED4F328024668D3@XXXX.XXX X.XXXX>
MIME-version: 1.0
X-MIMEOLE: Produced By Microsoft Exchange V6.5
Content-type: multipart/alternative; boundary="Boundary_(ID_MJr3+5NpTm/frcWQUwCh1w)"
Content-class: urn:content-classes:calendarmessage


Date: Mon, 10 Sep 2012 12:15:10 -0400
From: "XXXX" <XXXX@XXXX.XXXX>
Subject: XXXX
To: XXXX@XXXX.XXXX, "XXXX, XXXX" <XXXX@XXXX.XXXX>,
XXXX@XXXX.XXXX
Message-id:
<501E466D240EE74A9B908A0AFED4F328024668D3@XXXX.XXX X.XXXX>
MIME-version: 1.0
X-MIMEOLE: Produced By Microsoft Exchange V6.5
Content-type: multipart/mixed; boundary="----_=_NextPart_001_01CD8F6F.7386E206"
Content-class: urn:content-classes:calendarmessage