Outlook sent emails turn to dat file or winmail cannot be opened

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My email buddies receive the emails I forward to them as ".dat" files or "winmail" which nobody can open. What is converting my Outlook 2010 emails to dat or winmail?

Roady [MVP]

Configure Outlook to use Plain Text or HTML instead of RTF;
File-> Options-> Mail-> Compose messages in this format

If you are replying to an RTF-message, you'll need to convert it to HTML manually via the Format Text tab.

If it still doesn't work then, verify that your contact properties haven't been set to send as RTF.
See; Email attachments disappear when sent to others
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