Exchange 2007 corrupt message content

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 ##
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Jorge OcampoAsked:
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Simon Butler (Sembee)ConsultantCommented:
Number one reason is message interference.
Something like AV software scanning something it shouldn't be, or a third party tool scanning the messages. I have seen firewalls that scan SMTP traffic cause this before.
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suriyaehnopCommented:
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
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