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We had the same problem - several Lotus Notes recipients were receiving the winmail.dat file instead of the sent attachments. We tried setting the Outlook mail format to plain text which didn't help at all. Finally figured out that even though we were setting messages to plain text, they were being sent in MIME. Apparently Lotus Notes needs them to be sent in plain text/UUEncode. You can change the recipient send options by right clicking on the email address in the message you're about to send and choosing Send Options. Put a check in the box that says "I want to specify the format for messages to this recipient". Make sure MIME is unchecked and that Plain Text/UUEncode is checked at the bottom. Uncheck the BINHEX box (that's for Macintosh files). You can set this as the default send format for the recipient by going into their contact file, right-clicking on the email address and following these same steps. After making these changes we were able to send any attachment to Lotus Notes recipients. Hope this helps!

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