PC & Mobile

How to stop sending or receiving winmail.dat attachments in Outlook

When you ship an e-mail message from a Microsoft Outlook shopper that’s configured incorrectly, the receiver could obtain an attachment with the title winmail.dat. This is a binary attachment that features plain textual content and the formatting info of the e-mail message. In addition to this, the winmail.dat attachment might also embody the data, like the trail of the sender’s private folder (.pst) and the log-on title. Hence, to ensure that your info like your private folder (.pst) path and the log-on title just isn’t included in the winmail.dat file, it is best to stop Outlook from sending the winmail.dat attachments in each e-mail message. In this text, we are going to see how to stop sending or receiving winmail.dat attachments in Outlook.

What is the winmail.dat file?

Sometimes, Microsoft Outlook and Microsoft Exchange Client use a particular methodology to ship e-mail messages. Microsoft has named this methodology Transport Neutral Encapsulation Format (TNEF). Microsoft Outlook and Microsoft Exchange Client will ship the TNEF-encoded message if the Rich Text Format (RTF) setting is enabled in Outlook.

The binary attachment winmail.dat could embody the next info:

  • The formatting info of the e-mail message, like font type, coloration, and so on.
  • The OLE objects, like embedded photos.
  • Special Outlook options, like voting buttons, customized fonts, and so on.
  • Regular file attachments.

As defined beforehand in this text, the binary attachment winmail.dat might also embody the sender’s info, like his/her path of the .pst file, log-on title, and so on. The recipient can’t learn this info till he/she opens the winmail.dat file with binary or textual content editor software program. In any circumstances, the sender’s password just isn’t revealed to the recipient.

The recipient will obtain the decoded TNEF e-mail relying on the kind of e-mail shopper he makes use of. If the e-mail shopper of the recipient is ready to decode the TNEF e-mail message, he’ll see the e-mail in the identical format despatched by the sender. For instance, if the e-mail message accommodates the voting buttons, the recipient might be in a position to see the voting buttons provided that his e-mail shopper helps the TNEF encoding and decoding.

If you might be sending emails with common file attachments, you don’t require TNEF. Hence, for such kinds of e-mail messages, you possibly can choose the HTML or plain textual content format as a substitute of the TNEF format. Moreover, in case your recipient doesn’t use Outlook or Exchange Client, you shouldn’t use the TNEF format in your e-mail messages.

How to stop sending or receiving winmail.dat attachments on Outlook

When the e-mail shopper of the receiver doesn’t assist the TNEF encoding and decoding or doesn’t perceive the TNEF format, one of many following two issues will occur:

  • He will obtain the e-mail in a plain textual content format together with the attachment named winmail.dat.
  • He will obtain the e-mail in a plain textual content format together with the attachment with a generic title, like nnnn.dat or nnnn.eml, the place nnnn represents any random quantity.

Hence, it is vital to stop Outlook from sending winmail.dat attachments. You can strive the next strategies and see which one works for you.

  1. Change the Compose messages setting in Outlook
  2. Type the e-mail tackle of the recipient manually
  3. Delete the recipient’s contact and create it once more
  4. Disable TNEF in Windows Registry
  5. Disable Rich-text format on area

Let’s see all these strategies in element.

1] Change the Compose messages setting in Outlook

If the Compose messages setting in Outlook is ready to RTF (Rich-text Format), the recipient will obtain the winmail.dat attachment. To stop Outlook from sending the winmail.dat attachment to the recipients, change the Compose messages setting in Outlook. The steps for this are as follows.

make global change for TNEF setting in Outlook

  1. Open Microsoft Outlook.
  2. Go to “File > Options.” This will open the Outlook Options window.
  3. Select the Mail class from the left facet.
  4. Click on the Compose messages in this format drop-down and choose HTML or Plain Text. You will discover this feature beneath the Compose Messages part.
  5. Scroll down and find the Message format part.
  6. Select Convert to HTML format or Convert to Plain Text format in the “When sending messages in Rich Text format to Internet recipients” drop-down.
  7. Click OK to save the settings.

After performing the above steps, Outlook will ship all the e-mail messages both in HTML format or in Plain Text format relying on the choice you chose. Hence, the recipient won’t obtain the winmail.dat file attachment in the e-mail message.

If you do not need to do the worldwide change in Outlook for all the e-mail messages, you possibly can choose the HTML or Plain textual content format for a specific recipient simply earlier than sending the e-mail message. The following steps will present you ways to try this.

Change TNEF setting in Outlook for single mail

  1. Open Microsoft Outlook.
  2. Click New Email beneath the Home tab to open the Compose e-mail window.
  3. Click on the Format Text tab.
  4. Under the Format group, choose the HTML or Plain Text possibility.

2] Type the e-mail tackle of the recipient manually

Many customers have discovered this answer useful. If you choose the e-mail tackle of your recipients from the Address Book, do this trick. Type the e-mail tackle of the recipient manually as a substitute of choosing it from the Address Book and see if it helps.

3] Delete the recipient’s contact and create it once more

If the above methodology didn’t provide help to repair the issue, delete the recipient’s contact from Outlook and add it once more. The steps to delete a contact in Outlook are as follows:

Delete contact in Outlook

  1. Open Microsoft Outlook.
  2. Click People on the navigation pane. You will discover it on the underside left facet.
  3. Select the contact that you really want to delete and click on on the Delete button.

After deleting the contact, add it once more by clicking on the New Contact button.

4] Disable TNEF in Windows Registry

If Outlook remains to be sending the winmail.dat attachments to the recipients, you possibly can disable it in Windows Registry. Follow the beneath directions fastidiously as any mistake whereas enhancing the Registry keys may cause critical issues in your system. Before you proceed, we suggest you create a system restore level.

Disable TNEF in Windows Registry

Press the Win + R keys to launch the Run command field. When the Run command field seems, sort regedit and click on OK. Click Yes in the UAC immediate.

When the Registry Editor opens up, copy the next path, paste it into the tackle bar of the Registry Editor, and hit Enter.

HKEY_CURRENT_USERSoftwareMicrosoftOffice16.0OutlookPreferences

Make certain that the Preferences secret’s chosen from the left facet. Now, test if a Value named DisableTNEF exists on the correct facet or not. If not, you have got to create it. For this, right-click on the empty area on the correct facet and go to “New > DWORD (32-bit) Value.” Right-click on the newly created worth and choose Rename. Name it DisableTNEF. By default, the Value Data of all newly created values is 0. You have to change it to 1. To accomplish that, right-click on the DisableTNEF Value and choose Modify. Now, enter 1 in its Value Data.

5] Disable Rich-text format on area

Disable Rich-text format in Outlook 365

If you’re a Microsoft 365 for Business person, you possibly can disable the Rich-text format on Domain to stop Outlook from sending winmail.dat attachments to the recipients. To do that, open the Exchange admin heart and go to “Mil flow > Remote domain.” Now, double-click in your area and choose Never in the Use Rich-text format.

If you obtain the winmail.dat attachment from a specific sender in Outlook, you have got to ask the sender to make modifications in the Outlook Compose messages settings in order that you’ll obtain all of the emails both in Plain Text format or in HTML format.

Read: Fix Outlook not connecting to Server on Windows laptop.

How do I stop receiving winmail DAT recordsdata?

Currently, there is no such thing as a possibility accessible in Outlook that may provide help to stop receiving the winmail DAT recordsdata. Hence, in order for you to stop receiving the winmail.dat attachments in the e-mail messages, you have got to contact the sender from whom you might be receiving such attachments. Contact the sender and ask him to change the Outlook Compose messages settings from Rich-text format to both HTML format or Plain Text format.

How do I stop Outlook 365 from sending attachments as winmail dat?

To stop Outlook 365 from sending attachments as winmail dat, you have got to configure the Exchange settings. Open the Exchange admin heart after which go to “Mail > flow > Remote domain.” Now, choose Never in the Rich-text format part.

Hope this helps.

Read subsequent: Fix Outlook crashes when creating a brand new profile.

Stop sending or receiving winmail.dat attachments

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