Email recipients get winmail.dat attachment

Good morning,

I have a client who uses Outlook 2010 and upon sending PDF attachments to several recipients, the recipients only get a winmail.dat attachment. The standard fix from MS is to use plain text format. This does work for some recipients, however the client claims Mac recipients still get the error regardless of message format. Unfortunately, the client uses stationary with company logos, etc. and refuses to use plain text for official business. So far, I have not been able to resolve  the issue.

Any help is greatly appreciated!
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Will SzymkowskiSenior Solution ArchitectCommented:
The actual reason for Winmail.dat based on the client message format is because they are using Rich Text. Is this the case? Can they use switch to HTML?

investorscapitalAuthor Commented:
When the client composes the message, it's defaulted to HTML. The error occurs with HTML and RTF.
Shweta GoelCommented:
To fix this issue in Outlook 2010, add the DisableTNEF registry entry.
Try this:
Send messages in HTML or plain text format

1.On the Tools menu, click Options, and then click Mail Format.
2.Under Message Format, in the Compose in this message format list, click HTML or Plain Text.
3.Click OK.

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