Knowledgebase: Reflexion Encryption
Winmail.dat Attachments
Posted by Carlos Rios on 15 November 2017 02:46 PM

The presesnce of a WinMail.dat attachment indicates that the sender sent a secure message using Microsoft Outlook set to Rich Text Format (RTF). The Secure Message Center does not support this proprietary Microsoft format. The sender will need to resend the message with Outlook set to HTML or Plaintext.

Please note: This RTF setting can be set in multiple places within Outlook and Exchange. More information about these specific locations and settings can be found here: http://support.microsoft.com/kb/278061/en-US

These links from Microsoft also contain additional details:

http://support.microsoft.com/kb/138053
http://support.microsoft.com/kb/278061

Here are a few locations where this setting can be selected:

Within Outlook:

  • This can be set for all emails within Outlook's settings menu.
  • This can also be used if Outlook is configured to reply using the same format in which the original email was received.
  • This can be set on a per-recipient basis in Outlook's address book.

Here are a few links to help you with your specific version of Outlook:

Outlook 2013: http://office.microsoft.com/en-us/outlook-help/change-the-message-format-to-html-rich-text-format-or-plain-text-HA102749169.aspx
Outlook 2010: http://office.microsoft.com/en-us/outlook-help/change-the-message-format-to-html-rich-text-or-plain-text-HA101992313.aspx
Outlook 2007 or older: http://office.microsoft.com/en-us/outlook-help/change-the-message-format-to-html-rich-text-or-plain-text-HP001232996.aspx

Within Exchange:

Exchange also has a setting for sending all emails in Rich Text Format.

While your version of Exchange may be slightly different, the following should assist you with locating this setting:

Option 1: Edit the Hub Transport settings

  1. Open the Exchange Management Console
  2. Expand the "Organization Configuration" and select "Hub Transport"
  3. On the right hand side, go to the "Remote Domains" tab
  4. Right click on the configuration and select Properties
  5. Go to the "Message Format" tab
  6. Locate the "Exchange Rich-Text Format" section and select "Never Use"

Option 2: Configuring the Internet Mail Connector (IMC)

An administrator can configure the IMC with RTF options in the following manner:

  1. Open the Internet Mail Connector Properties page
  2. Click the General tab
  3. The "Send Microsoft Exchange Rich Text" list box controls the sending of rich-text data. There are three values to choose from. 
    Setting the value to "Never" will ensure that RTF data is never sent.

NOTE: An administrator can also configure the option to send RTF information on a domain-by-domain basis.


ERROR: This domain name does not match domain registered in the license key file (cms.orlinpilot.com), allowed domains: support.excelmicro.com,localhost, please change the product path to match the domain under Admin CP > Settings > General Settings
This product will not work properly unless untill that value is changed.

For more information please contact Kayako support at https://my.kayako.com