Winmail.dat attachments: Difference between revisions

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==Solutions==
==Solutions==
You can configure Thunderbird to use one of the programs below to open the TNEF attachment.
You can use one of the programs below to open the TNEF attachment, or configure Thunderbird to use one of the programs automatically.


* [http://www.kopf.com.br/winmail Winmail.dat Reader] Windows 95X though Windows Server 2003
* [https://addons.mozilla.org/thunderbird/addon/lookout LookOut extension]
 
* [http://www.winmail-dat.com/ Winmail.dat Reader] Windows 95X though Windows Server 2003
: [http://www.winmail-dat.com/online.php Online converter]


* [http://www.fentun.com/ Fentun] Win9X, NT, Win2K and WinXP
* [http://www.fentun.com/ Fentun] Win9X, NT, Win2K and WinXP
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* [http://www.download.com/Winmail-Opener/3000-2369_4-10477142.html Winmail Opener] Windows 95X though Windows Server 2003
* [http://www.download.com/Winmail-Opener/3000-2369_4-10477142.html Winmail Opener] Windows 95X though Windows Server 2003


* [http://sourceforge.net/projects/tnef/ TNEF] Linux
* [http://sourceforge.net/projects/tnef/ TNEF] Linux (may be available in your distribution's repository)


* [http://www.joshjacob.com/macdev/tnef/ TNEF's Enough] OS9 and OSX
* [http://www.joshjacob.com/macdev/tnef/ TNEF's Enough] OS9 and OSX


* [https://itunes.apple.com/us/app/winmail-file-viewer/id379500151?mt=8/ Winmail File Viewer] iPhone




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#On the "Tools" menu, click "Options", and then click the "Mail Format" tab.
#On the "Tools" menu, click "Options", and then click the "Mail Format" tab.
#In the "Send in this message format" list, click "Plain Text" or "HTML", and then click "OK".
#In the "Send in this message format" list, click "Plain Text" or "HTML", and then click "OK".
==See also==
*[[Every message has an attachment]]


==External links==
==External links==
* Bug report requesting [https://bugzilla.mozilla.org/show_bug.cgi?id=77811 Inline viewer for Microsoft proprietary mail formats (ms-tnef, etc.)]
*[http://support.microsoft.com/default.aspx?scid=KB;en-us;q241538 Microsoft article on TNEF]
*[http://support.microsoft.com/default.aspx?scid=KB;en-us;q241538 Microsoft article on TNEF]


*[http://support.microsoft.com/kb/q138053/ Microsoft article on how to prevent winmail.dat attachments from being sent to Internet users]
*[http://support.microsoft.com/kb/290809 Microsoft article on how to prevent winmail.dat attachments from being sent to Internet users]
 
*[http://www.slipstick.com/problems/outlook-is-sending-winmail-dat-attachments/ Step-by-step instructions for Outlook users with pictures]
 
* [https://www.lifewire.com/prevent-sending-winmail-dat-attachments-1173717 How to Prevent Winmail.dat Attachments from Being Sent in Outlook]


*[http://www.gpc.edu/~jbenson/resource/winmail.htm More solutions]
*[http://juliabensonslaughter.com/general-resources/the-winmail-dat-issue/ More solutions]


[[Category:Issues (Thunderbird)]]
[[Category:Issues (Thunderbird)]]
[[Category:Attachments (Thunderbird)]]
[[Category:Attachments (Thunderbird)]]

Revision as of 18:18, 28 January 2018

This article was written for Thunderbird but also applies to Mozilla Suite / SeaMonkey (though some menu sequences may differ).

Problem

The Microsoft Outlook e-mail program sometimes sends e-mails in the Transport Neutral Encapsulation Format (TNEF). Most other e-mail programs, including Thunderbird, do not understand TNEF.

If your e-mail program doesn't understand TNEF, instead of seeing the e-mail and/or attachment, you may only see an attachment named "winmail.dat" or "Part 1.2" that you cannot open. Also, sometimes you may receive a TNEF attachment with a generic name such as ATT00008.dat or ATT00005.eml instead.

Identifying TNEF attachments

While almost all attachments named "winmail.dat" are TNEF, you could receive non-TNEF attachments with names ending ".dat" or ".eml", or which are named or labeled "Part 1.2". In particular, AVG (an anti-virus program) can also add a "Part 1.2" attachment that contains the same information about the message having been scanned for viruses that it adds to end of the message body.

To verify whether or not you've received a TNEF attachment, highlight the message and click "View" -> "Message Source". Look for where the attachment begins; it looks something like the following (these are the "MIME headers"):

--------------050804030404070201030211
Content-Type: application/ms-tnef;
 name="winmail.dat"
Content-Transfer-Encoding: base64

If you see "Content-Type: application/ms-tnef" then it's a TNEF attachment. If you see another "Content-Type", then it's likely something else.

Solutions

You can use one of the programs below to open the TNEF attachment, or configure Thunderbird to use one of the programs automatically.

Online converter
  • Fentun Win9X, NT, Win2K and WinXP
  • TNEF Linux (may be available in your distribution's repository)


Disabling TNEF in Outlook

The sender can avoid sending TNEF attachments by by turning off TNEF in Outlook. When Outlook is configured to send e-mail in "Outlook Rich Text Format", it may use TNEF. When it sends in "HTML" or "Plain Text", it uses standard, compatible formats. There are two options for disbling TNEF:

In at least Outlook 2002 (a.k.a. Outlook XP) and Outlook 2003, if it's being used at a business, the following is recommended to ensure compatibility with corporate mail systems:

  1. On the "Tools" menu, click "Options", then click the "Mail Format" tab, and then the "Internet Format" button.
  2. Set "When sending Outlook Rich Text messages to Internet ..." to either "Convert to HTML format" or "Convert to Plain Text format".


In all versions of Outlook, you can disable TNEF completely:

  1. On the "Tools" menu, click "Options", and then click the "Mail Format" tab.
  2. In the "Send in this message format" list, click "Plain Text" or "HTML", and then click "OK".

See also

External links