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It is happened to all user or specific email? Have you try to send a test email with use html format?<br />
<br />
<a href="https://support.microsoft.com/en-us/kb/2203381" rel="ugc nofollow">https://support.microsoft.com/en-us/kb/2203381</a>
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It is happened to all user or specific email? Have you try to send a test email with use html format?

https://support.microsoft.com/en-us/kb/2203381 [https://support.microsoft.com/en-us/kb/2203381]

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<div class="content wysiwyg-content">
trying to investigate why it failed please see part of the header below<br />
<br />
Content-Type: application/ms-tnef; name=&quot;winmail.dat&quot;<br />
Content-Transfer-Encoding:<wbr /> binary<br />
<br />
#554 5.6.0 STOREDRV.Deliver; Corrupt message content ##
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trying to investigate why it failed please see part of the header below

Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary

#554 5.6.0 STOREDRV.Deliver; Corrupt message content ##

Exchange 2007 corrupt message content

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.