Outlook doesn't add any messages about 'defanged', so if that's the exact
error message you're seeing, it's from something else - server based
antivirus software, etc etc etc.
If you're just seeing winmail.dat as a file attachment, have everyone use
plain text or html as their message format - not rich text.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.