550 5.3.4 SMTPSEND.OverAdvertisedSize

A sender sent the following header information about an email they tried sending. Can someone please tell us if this header information was generated by the sending or receiving Exchange server? Thank you:

Generating server: SBEXMAIL-07.shuttslaw.sb
 
jsmith@dlnt.com
sbironport1.shutts-law.com #550 5.3.4 SMTPSEND.OverAdvertisedSize; message size exceeds fixed maximum size ##
 
Original message headers:
 
Received: from SBEXMAIL-07.shuttslaw.sb ([2002:901:101::901:101]) by
 SBEXMAIL-07.shuttslaw.sb ([2002:901:101::901:101]) with mapi; Thu, 23 Apr
 2015 10:06:06 -0400
From: "Terri M. Clark" <TClark@shutts.com>
To: "'John J. Smith'" <jsmith@dlnt.com>
Date: Thu, 23 Apr 2015 10:06:04 -0400
Subject: FW: Chapman Appraisal and Substitution/Replacement Costs Reports
Thread-Topic: Chapman Appraisal and Substitution/Replacement Costs Reports
Thread-Index: Ac8ueM8Wi/jc8QVrTLOHXytWKsixJFJKzHdAADUqJ4AAAtJnQAEIvMuQAEnqf1A=
Message-ID: <23312C3386742D439790646C3EE905B70380BE8D44@SBEXMAIL-07.shuttslaw.sb>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/mixed;
        boundary="_013_23312C3386742D439790646C3EE905B70380BE8D44SBEXMAIL07shu_"
MIME-Version: 1.0