Sometimes individuals on UBmail Powered by Exchange send
messages that contian a file called Winmail.dat that some other
email clients can't open properly. See how to configure Outlook to
not send those files.
Outlook can use a method called Transport Neutral Encapsulation
Format (TNEF) to package information for sending messages. The use
of TNEF is affected by settings in Outlook that are referred to as
Rich Text Format (RTF).
A TNEF-encoded message contains a plain text version of the
message and a bundled binary attachment that contains the other
parts of the original message. This attachment is named
Winmail.dat, and includes:
- The formatted text version of the message (including fonts or
colors)
- OLE objects (embedded pictures and embedded Office
documents)
- Special Outlook features (custom forms and meeting
requests)
- Any file attachments that were attached to the original
message
Unfortunately, the Winmail.dat bundled attachment is not
readable by many other email clients or by Outllook for Macintosh
and it may even appear to the recipient as though the expected
attachment is missing.
Set the Global Properties to have Outlook by default send your
email in Hypertext Markup Language (HTML):
- Outlook 2007: Select Tools >
Options>
Email Format >
Internet Options. SelectConvert to HTML format.
- Outlook 2010 and 2013: Select File >Options >
Mail and then scroll to the bottom of
the dialog. Select Convert to HTML format.
Meeting requests or voting buttons may not work with this
setting, but you can override the format on select messages.