Why are email attachments coming through Zix as winmail.DAT files to the reciepient

I am receiving Zixcorp secure emails from the same domain and from two different origination points.  One of the sender's email attachments are coming through unchanged, but all email attachments from the other sender are coming across as winmail.DAT files.  Does any one know how to resolve the problem?

Thank you
mcarsonsrAsked:
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Davis McCarnOwnerCommented:
Winmail.dat is not the attachment; but, rather what is supposed to be embedded coding to preserve rich text formatted messages.
Have the sender change his Outlook option to send HTML instead of RTF:
Method 4: Set the Outlook Rich Text Format Internet e-mail setting

1.In Outlook 2003 and Outlook 2007, click Options on the Tools menu.
2.Click the Mail Format tab.
3.Click Internet Format.
4.Under Outlook Rich Text options, click either Convert to HTML format or Convert to Plain Text format.

http://support.microsoft.com/kb/278061
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