winmail.dat received instead of attachment
Posted by Carlos Rios on 17 November 2017 07:20 PM
I sent a user a file attachment and they received a winmail.dat attachment instead in the Secure Message Center
The WinMail.dat attachment indicates 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
The below links from Microsoft also have additional details:
Below are a few locations where this setting can be selected:
* This can be set for all emails within Outlook’s mail options.
* 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.
* Exchange also has a setting to send all emails in Rich Text Format.
While your version of Exchange may be slightly different, the below should assist you with locating and correcting this setting:
Option 1) Edit the Hub Transport settings
Option 2) Configuring the Internet Mail Connector (IMC):