Transport Neutral Encapsulation Format or TNEF is a proprietary email attachment format used by Microsoft Outlook and Microsoft Exchange Server. An attached file with TNEF encoding is most often named winmail.dat or win.dat, and has a MIME type of Application/MS-TNEF. The official (IANA) media type, however, is application/vnd.ms-tnef.
Sample request schema:
This API endpoint expects in the request body a JSON with a “content” property
content: “BASE-64 encoded string of a TNEF file”
For quick testing you can convert your winmail.dat (TNEF encoded file) into a base-64 encoded string with online converter:
Some email clients or third party applications that receive emails cannot interpret the TNEF-encoded file that comes from users that are using Microsoft Outlook as their main email client to send their emails with having the TNEF feature activated. With a custom implementation /business process flow that is using our API it would be still possible to parse out and extract the attachted documents in order to store these files on your client or in your third party application.
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