Transport Neutral Encapsulation Format or TNEF is a proprietary E-mail attachment format used by Microsoft Outlook and Microsoft Exchange Server.

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How can I confirm if Exchange 2010 is configured to always use TNEF when sending to certain domains?

I suspect that Exchange 2010 is configured to use the TNEF message format when sending to certain recipient domains. Where can I check (server-side) to confirm if this is the case? I'm familiar with ...
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Decode TNEF / winmail.dat in whole Maildir

because of a transition from MS Exchange to Courier IMAP, all our old mail messages have a winmail.dat attachment, which sometimes contains also the message's original attachments. I am looking for a ...