Transport Neutral Encapsulation Format (TNEF) is a Microsoft standard for
tunneling rich data over the Internet to a recipient. Rich data includes
Microsoft Rich Text Format (RTF) text, OLE objects, file attachments, and
other application data such as Microsoft Outlook calendar data. Microsoft
Outlook clients and Microsoft Exchange can be configured to format emails
for sending to recipients who use Microsoft Outlook. In such a configuration,
MS Outlook sends the RTF data as plain text and places all other objects
into the TNEF stream, which is usually attached to the email as a file
By default, the TNEF Converter discards the TNEF object attachment when
it successfully completes a conversion. The attachment will be retained
if the conversion cannot be performed.
The TNEF Converter is built into the Domino SMTP task. TNEFEnableConversion=1
must exist in order for TNEFKeepAttachment to have any effect.
Preserving the winmail.dat file is disabled by default, which is equivalent
to having the TNEFKeepAttachment setting absent or set to 0.
Leave this option disabled such that the original file attachment will
This Domino feature became available in versions 6.5.6 and 7.02.
TNEFBreakSMIME, TNEFConverter_Log_Level, TNEFAttachRTF, TNEFEnableConversion
to messages received from the Internet are named as winmail.dat
7.0.2 Release Notes
Domino Configuration Tuner:
This setting is included in the DCT
catalog of best practices.